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Tandem Organic Solar Cells: Nonfullerene Tandem Organic Solar Cells with High Open‐Circuit Voltage of 1.97 V (Adv. Mater. 44/2016) 下载免费PDF全文
Wenqing Liu Shuixing Li Jiang Huang Shida Yang Jiehuan Chen Lijian Zuo Minmin Shi Xiaowei Zhan Chang‐Zhi Li Hongzheng Chen 《Advanced materials (Deerfield Beach, Fla.)》2016,28(44):9870-9870
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Achieving 12.8% Efficiency by Simultaneously Improving Open‐Circuit Voltage and Short‐Circuit Current Density in Tandem Organic Solar Cells 下载免费PDF全文
Yunpeng Qin Yu Chen Yong Cui Shaoqing Zhang Huifeng Yao Jiang Huang Wanning Li Zhong Zheng Jianhui Hou 《Advanced materials (Deerfield Beach, Fla.)》2017,29(24)
Tandem organic solar cells (TOSCs), which integrate multiple organic photovoltaic layers with complementary absorption in series, have been proved to be a strong contender in organic photovoltaic depending on their advantages in harvesting a greater part of the solar spectrum and more efficient photon utilization than traditional single‐junction organic solar cells. However, simultaneously improving open circuit voltage (Voc) and short current density (Jsc) is a still particularly tricky issue for highly efficient TOSCs. In this work, by employing the low‐bandgap nonfullerene acceptor, IEICO, into the rear cell to extend absorption, and meanwhile introducing PBDD4T‐2F into the front cell for improving Voc, an impressive efficiency of 12.8% has been achieved in well‐designed TOSC. This result is also one of the highest efficiencies reported in state‐of‐the‐art organic solar cells. 相似文献
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Yamin Zhang Bin Kan Yanna Sun Yanbo Wang Ruoxi Xia Xin Ke Yuan‐Qiu‐Qiang Yi Chenxi Li Hin‐Lap Yip Xiangjian Wan Yong Cao Yongsheng Chen 《Advanced materials (Deerfield Beach, Fla.)》2018,30(18)
Fabricating solar cells with tandem structure is an efficient way to broaden the photon response range without further increasing the thermalization loss in the system. In this work, a tandem organic solar cell (TOSC) based on highly efficient nonfullerene acceptors (NFAs) with series connection type is demonstrated. To meet the different demands of front and rear sub‐cells, two NFAs named F‐M and NOBDT with a whole absorption range from 300 to 900 nm are designed, when blended with wide bandgap polymer poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)‐benzo[1,2‐b:4,5‐b′]dithiophene))‐alt‐(5,5‐(1′,3′‐di‐2‐thienyl‐5′,7′‐bis(2‐ethylhexyl)benzo[1′,2′‐c:4′,5′‐c′]dithiophene‐4,8‐dione))] (PBDB‐T) and narrow bandgap polymer PTB7‐Th, respectively, the PBDB‐T: F‐M system exhibits a high Voc of 0.98 V and the PTB7‐Th: NOBDT system shows a remarkable Jsc of 19.16 mA cm?2, which demonstrate their potential in the TOSCs. With the guidance of optical simulation, by systematically optimizing the thickness of each layer in the TOSC, an outstanding power conversion efficiency of 14.11%, with a Voc of 1.71 V, a Jsc of 11.72 mA cm?2, and a satisfactory fill factor of 0.70 is achieved; this result is one of the top efficiencies reported to date in the field of organic solar cells. 相似文献
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Achieving Highly Efficient Nonfullerene Organic Solar Cells with Improved Intermolecular Interaction and Open‐Circuit Voltage 下载免费PDF全文
Huifeng Yao Long Ye Junxian Hou Bomee Jang Guangchao Han Yong Cui Gregory M. Su Cheng Wang Bowei Gao Runnan Yu Hao Zhang Yuanping Yi Han Young Woo Harald Ade Jianhui Hou 《Advanced materials (Deerfield Beach, Fla.)》2017,29(21)
A new acceptor–donor–acceptor‐structured nonfullerene acceptor ITCC (3,9‐bis(4‐(1,1‐dicyanomethylene)‐3‐methylene‐2‐oxo‐cyclopenta[b]thiophen)‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d′:2,3‐d′]‐s‐indaceno[1,2‐b:5,6‐b′]‐dithiophene) is designed and synthesized via simple end‐group modification. ITCC shows improved electron‐transport properties and a high‐lying lowest unoccupied molecular orbital level. A power conversion efficiency of 11.4% with an impressive V OC of over 1 V is recorded in photovoltaic devices, suggesting that ITCC has great potential for applications in tandem organic solar cells. 相似文献
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Lijian Zuo Jiangsheng Yu Xueliang Shi Francis Lin Weihua Tang Alex K.‐Y. Jen 《Advanced materials (Deerfield Beach, Fla.)》2017,29(34)
In this work, a highly efficient parallel connected tandem solar cell utilizing a nonfullerene acceptor is demonstrated. Guided by optical simulation, each of the active layer thicknesses of subcells are tuned to maximize its light trapping without spending intense effort to match photocurrent. Interestingly, a strong optical microcavity with dual oscillation centers is formed in a back subcell, which further enhances light absorption. The parallel tandem device shows an improved photon‐to‐electron response over the range between 450 and 800 nm, and a high short‐circuit current density (J SC) of 17.92 mA cm?2. In addition, the subcells show high fill factors due to reduced recombination loss under diluted light intensity. These merits enable an overall power conversion efficiency (PCE) of >10% for this tandem cell, which represents a ≈15% enhancement compared to the optimal single‐junction device. Further application of the designed parallel tandem configuration to more efficient single‐junction cells enable a PCE of >11%, which is the highest efficiency among all parallel connected organic solar cells (OSCs). This work stresses the importance of employing a parallel tandem configuration for achieving efficient light harvesting in nonfullerene‐based OSCs. It provides a useful strategy for exploring the ultimate performance of organic solar cells. 相似文献
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Reduced Interface‐Mediated Recombination for High Open‐Circuit Voltages in CH3NH3PbI3 Solar Cells 下载免费PDF全文
Christian M. Wolff Fengshuo Zu Andreas Paulke Lorena Perdigón Toro Norbert Koch Dieter Neher 《Advanced materials (Deerfield Beach, Fla.)》2017,29(28)
Perovskite solar cells with all‐organic transport layers exhibit efficiencies rivaling their counterparts that employ inorganic transport layers, while avoiding high‐temperature processing. Herein, it is investigated how the choice of the fullerene derivative employed in the electron‐transporting layer of inverted perovskite cells affects the open‐circuit voltage (VOC). It is shown that nonradiative recombination mediated by the electron‐transporting layer is the limiting factor for the VOC in the cells. By inserting an ultrathin layer of an insulating polymer between the active CH3NH3PbI3 perovskite and the fullerene, an external radiative efficiency of up to 0.3%, a VOC as high as 1.16 V, and a power conversion efficiency of 19.4% are realized. The results show that the reduction of nonradiative recombination due to charge‐blocking at the perovskite/organic interface is more important than proper level alignment in the search for ideal selective contacts toward high VOC and efficiency. 相似文献
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Saar Kirmayer Eran Edri Douglas Hines Nir Klein‐Kedem Hagai Cohen Olivia Niitsoo Iddo Pinkas Prashant V. Kamat Gary Hodes 《Advanced Materials Interfaces》2015,2(1)
TiO2/CdSe/CuSCN extremely thin absorber (ETA) solar cells are found to give relatively high values of open‐circuit voltage (>0.8 V) but low currents upon annealing the cadmium selenide (CdSe) in air (500 ºC). Annealing in N2 produces much lower photovoltages and slightly lower photocurrents. Band structure measurements show differences between the two annealing regimes that, however, appear to favor the N2‐annealed CdSe. On the other hand, chemically resolved electrical measurements (CREM) of the cells reveal marked differences in photo‐induced charge trapping, in particular at absorber grain boundaries of the air versus N2‐annealed systems, correlated with the formation of Cd–O species at the CdSe surface. Using transient absorption and photovoltage decay, pronounced lifetime differences are also observed, in agreement with the strong suppression of charge recombination. The results point to a multiple role of grain surface‐oxidation, which both impedes electron injection from the CdSe to the TiO2, but, much more significantly, enhances hole injection to the CuSCN via passivation of hole traps that act as efficient recombination centers. 相似文献
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Realizing Small Energy Loss of 0.55 eV,High Open‐Circuit Voltage >1 V and High Efficiency >10% in Fullerene‐Free Polymer Solar Cells via Energy Driver 下载免费PDF全文
Pei Cheng Mingyu Zhang Tsz‐Ki Lau Yao Wu Boyu Jia Jiayu Wang Cenqi Yan Meng Qin Xinhui Lu Xiaowei Zhan 《Advanced materials (Deerfield Beach, Fla.)》2017,29(11)
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Jiali Song Chao Li Lei Zhu Jing Guo Jinqiu Xu Xuning Zhang Kangkang Weng Kangning Zhang Jie Min Xiaotao Hao Yuan Zhang Feng Liu Yanming Sun 《Advanced materials (Deerfield Beach, Fla.)》2019,31(52)
A ternary structure has been demonstrated as being an effective strategy to realize high power conversion efficiency (PCE) in organic solar cells (OSCs); however, general materials selection rules still remain incompletely understood. In this work, two nonfullerene small‐molecule acceptors 3TP3T‐4F and 3TP3T‐IC are synthesized and incorporated as a third component in PM6:Y6 binary blends. The photovoltaic behaviors in the resultant ternary OSCs differ significantly, despite the comparable energy levels. It is found that incorporation of 15% 3TP3T‐4F into the PM6:Y6 blend results in facilitating exciton dissociation, increasing charge transport, and reducing trap‐assisted recombination. All these features are responsible for the enlarged PCE of 16.7% (certified as 16.2%) in the PM6:Y6:3TP3T‐4F ternary OSCs, higher than that (15.6%) in the 3TP3T‐IC containing ternary devices. The performance differences are mainly ascribed to the compatibility between the third component and the host materials. The 3TP3T‐4F guest acceptor exhibits an excellent compatibility with Y6, tending to form well‐mixed phases in the ternary blend without disrupting the favored bicontinuous transport networks, whereas 3TP3T‐IC displays a morphological incompatibility with Y6. This work highlights the importance of considering the compatibility for materials selection toward high‐efficiency ternary organic OSCs. 相似文献
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Blade‐Cast Nonfullerene Organic Solar Cells in Air with Excellent Morphology,Efficiency, and Stability 下载免费PDF全文
Lin Zhang Baojun Lin Bo Hu Xianbin Xu Wei Ma 《Advanced materials (Deerfield Beach, Fla.)》2018,30(22)
Blade‐coating serving as a prototype tool for slot‐die coating can be very compatible with large‐area roll‐to‐roll coating. Using blade‐coating in an ambient environment, an average power conversion efficiency (PCE) of 10.03% is achieved in nonfullerene organic solar cells, which is higher than that of the optimal spin‐coated device with a PCE of 9.41%. It is demonstrated that blade‐coating can induce a higher degree of molecular packing for both conjugated polymer donors and small‐molecular acceptors as it helps to produce a seeding film containing numerous crystal grains, subsequently providing nucleation sites for the residual solution when the motion of the blade exposes a liquid front. Due to this effect, blade‐coating can partially replace the role of the additive 1,8‐diiodooctane (DIO) and thus achieves the optimized morphology with fewer additives. Moreover, it is found that the blade‐coated film with 0.25% DIO possesses not only a smaller domain size but also higher domain purity, suggesting more D/A (donor/acceptor) interfaces and a purer phase domain as compared to the spin‐coated film with 1% DIO. Encouragingly, the blade‐coated device with less DIO (0.25%) exhibits much better stability than the spin‐coated device with 1% DIO, showing excellent prospects. 相似文献
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Efficient Semitransparent Organic Solar Cells with Tunable Color enabled by an Ultralow‐Bandgap Nonfullerene Acceptor 下载免费PDF全文
Yong Cui Chenyi Yang Huifeng Yao Jie Zhu Yuming Wang Guoxiao Jia Feng Gao Jianhui Hou 《Advanced materials (Deerfield Beach, Fla.)》2017,29(43)
Semitransparent organic solar cells (OSCs) show attractive potential in power‐generating windows. However, the development of semitransparent OSCs is lagging behind opaque OSCs. Here, an ultralow‐bandgap nonfullerene acceptor, “IEICO‐4Cl”, is designed and synthesized, whose absorption spectrum is mainly located in the near‐infrared region. When IEICO‐4Cl is blended with different polymer donors (J52, PBDB‐T, and PTB7‐Th), the colors of the blend films can be tuned from purple to blue to cyan, respectively. Traditional OSCs with a nontransparent Al electrode fabricated by J52:IEICO‐4Cl, PBDB‐T:IEICO‐4Cl, and PTB7‐Th:IEICO‐4Cl yield power conversion efficiencies (PCE) of 9.65 ± 0.33%, 9.43 ± 0.13%, and 10.0 ± 0.2%, respectively. By using 15 nm Au as the electrode, semitransparent OSCs based on these three blends also show PCEs of 6.37%, 6.24%, and 6.97% with high average visible transmittance (AVT) of 35.1%, 35.7%, and 33.5%, respectively. Furthermore, via changing the thickness of Au in the OSCs, the relationship between the transmittance and efficiency is studied in detail, and an impressive PCE of 8.38% with an AVT of 25.7% is obtained, which is an outstanding value in the semitransparent OSCs. 相似文献
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An Unfused‐Core‐Based Nonfullerene Acceptor Enables High‐Efficiency Organic Solar Cells with Excellent Morphological Stability at High Temperatures 下载免费PDF全文
Shuixing Li Lingling Zhan Feng Liu Jie Ren Minmin Shi Chang‐Zhi Li Thomas P. Russell Hongzheng Chen 《Advanced materials (Deerfield Beach, Fla.)》2018,30(6)
Most nonfullerene acceptors developed so far for high‐performance organic solar cells (OSCs) are designed in planar molecular geometry containing a fused‐ring core. In this work, a new nonfullerene acceptor of DF‐PCIC is synthesized with an unfused‐ring core containing two cyclopentadithiophene (CPDT) moieties and one 2,5‐difluorobenzene (DFB) group. A nearly planar geometry is realized through the F···H noncovalent interaction between CPDT and DFB for DF‐PCIC. After proper optimizations, the OSCs with DF‐PCIC as the acceptor and the polymer PBDB‐T as the donor yield the best power conversion efficiency (PCE) of 10.14% with a high fill factor of 0.72. To the best of our knowledge, this efficiency is among the highest values for the OSCs with nonfullerene acceptors owning unfused‐ring cores. Furthermore, no obvious morphological changes are observed for the thermally treated PBDB‐T:DF‐PCIC blended films, and the relevant devices can keep ≈70% of the original PCEs upon thermal treatment at 180 °C for 12 h. This tolerance of such a high temperature for so long time is rarely reported for fullerene‐free OSCs, which might be due to the unique unfused‐ring core of DF‐PCIC. Therefore, the work provides new idea for the design of new nonfullerene acceptors applicable in commercial OSCs in the future. 相似文献
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Over 14% Efficiency in Organic Solar Cells Enabled by Chlorinated Nonfullerene Small‐Molecule Acceptors 下载免费PDF全文
Hao Zhang Huifeng Yao Junxian Hou Jie Zhu Jianqi Zhang Wanning Li Runnan Yu Bowei Gao Shaoqing Zhang Jianhui Hou 《Advanced materials (Deerfield Beach, Fla.)》2018,30(28)
To make organic solar cells (OSCs) more competitive in the diverse photovoltaic cell technologies, it is very important to demonstrate that OSCs can achieve very good efficiencies and that their cost can be reduced. Here, a pair of nonfullerene small‐molecule acceptors, IT‐2Cl and IT‐4Cl, is designed and synthesized by introducing easy‐synthesis chlorine substituents onto the indacenodithieno[3,2‐b]thiophene units. The unique feature of the large dipole moment of the C? Cl bond enhances the intermolecular charge‐transfer effect between the donor–acceptor structures, and thus expands the absorption and down shifts the molecular energy levels. Meanwhile, the introduction of C? Cl also causes more pronounced molecular stacking, which also helps to expand the absorption spectrum. Both of the designed OSCs devices based on two acceptors can deliver a power conversion efficiency (PCE) greater than 13% when blended with a polymer donor with a low‐lying highest occupied molecular orbital level. In addition, since IT‐2Cl and IT‐4Cl have very good compatibility, a ternary OSC device integrating these two acceptors is also fabricated and obtains a PCE greater than 14%. Chlorination demonstrates effective ability in enhancing the device performance and facile synthesis route, which both deserve further exploitation in the modification of photovoltaic materials. 相似文献
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Fully Solution‐Processed n–i–p‐Like Perovskite Solar Cells with Planar Junction: How the Charge Extracting Layer Determines the Open‐Circuit Voltage 下载免费PDF全文
Chen Tao Jeroen Van Der Velden Lydia Cabau Nuria F. Montcada Stefanie Neutzner Ajay Ram Srimath Kandada Sergio Marras Luigi Brambilla Matteo Tommasini Weidong Xu Roberto Sorrentino Andrea Perinot Mario Caironi Chiara Bertarelli Emilio Palomares Annamaria Petrozza 《Advanced materials (Deerfield Beach, Fla.)》2017,29(15)
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