共查询到20条相似文献,搜索用时 10 毫秒
1.
2.
3.
4.
5.
6.
Sung Jae Jeon Yong Woon Han Doo Kyung Moon 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(41)
To industrialize nonfullerene polymer solar cells (NFPSCs), the molecular design of the donor polymers must feature low‐cost materials and a high overall yield. Two chlorinated thiophene‐based polymers, P(F–Cl) and P(Cl–Cl), are synthesized by introducing halogen effects like fluorine (F) and chlorine (Cl) to the previously reported P(Cl), which exhibits low complexity. However, the molecular weights of these polymers are insufficient owing to their low solubility, which in turn is caused by introducing rigid halogen atoms during the polymerization. Thus, they show relatively low power conversion efficiencies (PCEs) of 11.8% and 10.3%, respectively. To overcome these shortcomings, two new terpolymers are designed and synthesized by introducing a small amount of 1,3‐bis(5‐bromothiophen‐2‐yl)‐5,7‐bis(2‐ethylhexyl)benzo[1,2‐c:4,5‐c′]dithiophene‐4,8‐dione (BDD) unit into each backbone, namely, P(F–Cl)(BDD = 0.2) and P(Cl–Cl)(BDD = 0.2). As a result, both polymers remain inexpensive and show a better molecular weight–solubility balance, achieving high PCEs of 12.7% and 13.9%, respectively, in NFPSCs processed using eco‐friendly solvents. 相似文献
7.
8.
9.
10.
Small‐Bandgap Polymer Solar Cells with Unprecedented Short‐Circuit Current Density and High Fill Factor 下载免费PDF全文
Hyosung Choi Seo‐Jin Ko Taehyo Kim Pierre‐Olivier Morin Bright Walker Byoung Hoon Lee Mario Leclerc Jin Young Kim Alan J. Heeger 《Advanced materials (Deerfield Beach, Fla.)》2015,27(21):3318-3324
11.
Improved Performance of All‐Polymer Solar Cells Enabled by Naphthodiperylenetetraimide‐Based Polymer Acceptor 下载免费PDF全文
Yikun Guo Yunke Li Omar Awartani Han Han Jingbo Zhao Harald Ade He Yan Dahui Zhao 《Advanced materials (Deerfield Beach, Fla.)》2017,29(26)
A new polymer acceptor, naphthodiperylenetetraimide‐vinylene (NDP‐V), featuring a backbone of altenating naphthodiperylenetetraimide and vinylene units is designed and applied in all‐polymer solar cells (all‐PSCs). With this polymer acceptor, a new record power‐conversion efficiencies (PCE) of 8.59% has been achieved for all‐PSCs. The design principle of NDP‐V is to reduce the conformational disorder in the backbone of a previously developed high‐performance acceptor, PDI‐V, a perylenediimide‐vinylene polymer. The chemical modifications result in favorable changes to the molecular packing behaviors of the acceptor and improved morphology of the donor–acceptor (PTB7‐Th:NDP‐V) blend, which is evidenced by the enhanced hole and electron transport abilities of the active layer. Moreover, the stronger absorption of NDP‐V in the shorter‐wavelength range offers a better complement to the donor. All these factors contribute to a short‐circuit current density (J sc) of 17.07 mA cm?2. With a fill factor (FF) of 0.67, an average PCE of 8.48% is obtained, representing the highest value thus far reported for all‐PSCs. 相似文献
12.
用Stille聚合法合成了基于4,8-二(2,3-二已基噻吩)苯并[1,2-b:4,5-b’]二噻吩(BDTT)和噻吩并[3,4-c]吡咯-4,6-二酮(TPD)单元的窄带系D-A共聚物PBDTT-LTPD-M,其主链内受体单元的密度增加,具有较低的HOMO能级(-5.50eV)。用于聚合物太阳能电池中,使电池的开路电压(Voc)达到0.87V,器件的短路电流(Jsc)为6.07mA/cm^2,填充因子(FF)50.22%,光电转换效率(PCE)为2.67%。 相似文献
13.
14.
15.
16.
High‐Performance All‐Polymer Solar Cells Via Side‐Chain Engineering of the Polymer Acceptor: The Importance of the Polymer Packing Structure and the Nanoscale Blend Morphology 下载免费PDF全文
Changyeon Lee Hyunbum Kang Wonho Lee Taesu Kim Ki‐Hyun Kim Han Young Woo Cheng Wang Bumjoon J. Kim 《Advanced materials (Deerfield Beach, Fla.)》2015,27(15):2466-2471
17.
Fine‐Tuning of Molecular Packing and Energy Level through Methyl Substitution Enabling Excellent Small Molecule Acceptors for Nonfullerene Polymer Solar Cells with Efficiency up to 12.54% 下载免费PDF全文
Zhenghui Luo Haijun Bin Tao Liu Zhi‐Guo Zhang Yankang Yang Cheng Zhong Beibei Qiu Guanghao Li Wei Gao Dongjun Xie Kailong Wu Yanming Sun Feng Liu Yongfang Li Chuluo Yang 《Advanced materials (Deerfield Beach, Fla.)》2018,30(9)
A novel small molecule acceptor MeIC with a methylated end‐capping group is developed. Compared to unmethylated counterparts (ITCPTC), MeIC exhibits a higher lowest unoccupied molecular orbital (LUMO) level value, tighter molecular packing, better crystallites quality, and stronger absorption in the range of 520–740 nm. The MeIC‐based polymer solar cells (PSCs) with J71 as donor, achieve high power conversion efficiency (PCE), up to 12.54% with a short‐circuit current (JSC) of 18.41 mA cm?2, significantly higher than that of the device based on J71:ITCPTC (11.63% with a JSC of 17.52 mA cm?2). The higher JSC of the PSC based on J71:MeIC can be attributed to more balanced μh/μe, higher charge dissociation and charge collection efficiency, better molecular packing, and more proper phase separation features as indicated by grazing incident X‐ray diffraction and resonant soft X‐ray scattering results. It is worth mentioning that the as‐cast PSCs based on MeIC also yield a high PCE of 11.26%, which is among the highest value for the as‐cast nonfullerene PSCs so far. Such a small modification that leads to so significant an improvement of the photovoltaic performance is a quite exciting finding, shining a light on the molecular design of the nonfullerene acceptors. 相似文献
18.
Low Band‐Gap Conjugated Polymers with Strong Interchain Aggregation and Very High Hole Mobility Towards Highly Efficient Thick‐Film Polymer Solar Cells 下载免费PDF全文
Junwu Chen Xuncheng Liu Lianjie Zhang Linfeng Lan Junbiao Peng Yuguang Ma Yong Cao 《Advanced materials (Deerfield Beach, Fla.)》2014,26(16):2586-2591
19.