Hybrid Block Copolymer/Perovskite Heterointerfaces for Efficient Solar Cells

Solution processable semiconductors like organics and emerging lead halide perovskites (LHPs) are ideal candidates for photovoltaics combining high performance and flexibility with reduced manufacturing cost. Moreover, the study of hybrid semiconductors would lead to advanced structures and deep understanding that will propel this field even further. Herein, a novel device architecture involving block copolymer/perovskite hybrid bulk heterointerfaces is investigated, such a modification could enhance light absorption, create an energy level cascade, and provides a thin hydrophobic layer, thus enabling enhanced carrier generation, promoting energy transfer and preventing moisture invasion, respectively. The resulting hybrid block copolymer/perovskite solar cell exhibits a champion efficiency of 24.07% for 0.0725 cm²-sized devices and 21.44% for 1 cm²-sized devices, respectively, together with enhanced stability, which is among the highest reports of organic/perovskite hybrid devices. More importantly, this approach has been effectively extended to other LHPs with different chemical compositions like MAPbI₃ and CsPbI₃, which may shed light on the design of highly efficient block copolymer/perovskite hybrid materials and architectures that would overcome current limitations for realistic application exploration.     

ZnO纳米结构/聚合物杂化太阳能电池的研究进展

在介绍电池基本理论和共混结构、取向结构不同特点的基础上,综述了近年来这两种不同结构纳米ZnO/聚合物杂化太阳能电池的最新研究进展。分析表明目前电池效率较低与光吸收效率较低、光谱吸收范围较窄、载流子迁移率不均衡、界面相容性较差等问题有关。     

Hybrid Solar Cells with a Sunlight Concentrator System

Technical Physics Letters - Hybrid solar cells based on InGaP/Ga(In)As/Ge multijunction structures integrated into crystalline Si heat-removal base and provided with sunlight concentrator system...     

Monolithic Organic/Colloidal Quantum Dot Hybrid Tandem Solar Cells via Buffer Engineering

Monolithically integrated hybrid tandem solar cells (TSCs) that combine solution-processed colloidal quantum dot (CQD) and organic molecules are a promising device architecture, able to complement the absorption across the visible to the infrared. However, the performance of organic/CQD hybrid TSCs has not yet surpassed that of single-junction CQD solar cells. Here, a strategic optical structure is devised to overcome the prior performance limit of hybrid TSCs by employing a multibuffer layer and a dual near-infrared (NIR) absorber. In particular, a multibuffer layer is introduced to solve the problem of the CQD solvent penetrating the underlying organic layer. In addition, the matching current of monolithic TSCs is significantly improved to 15.2 mA cm⁻² by using a dual NIR organic absorber that complements the absorption of CQD. The hybrid TSCs reach a power conversion efficiency (PCE) of 13.7%, higher than that of the corresponding individual single-junction cells, representing the highest efficiency reported to date for CQD-based hybrid TSCs.     

Improved Hybrid Solar Cells via in situ UV Polymerization

One approach for making inexpensive inorganic–organic hybrid photovoltaic (PV) cells is to fill highly ordered TiO₂ nanotube (NT) arrays with solid organic hole conductors such as conjugated polymers. Here, a new in situ UV polymerization method for growing polythiophene (UV‐PT) inside TiO₂ NTs is presented and compared to the conventional approach of infiltrating NTs with pre‐synthesized polymer. A nanotubular TiO₂ substrate is immersed in a 2,5‐diiodothiophene (DIT) monomer precursor solution and then irradiated with UV light. The selective UV photodissociation of the C? I bond produces monomer radicals with intact π‐ring structure that further produce longer oligothiophene/PT molecules. Complete photoluminescence quenching upon UV irradiation suggests coupling between radicals created from DIT and at the TiO₂ surface via a charge transfer complex. Coupling with the TiO₂ surface improves UV‐PT crystallinity and π–π stacking; flat photocurrent values show that charge recombination during hole transport through the polymer is negligible. A non‐ideal, backside‐illuminated setup under illumination of 620‐nm light yields a photocurrent density of ≈5 µA cm²—surprisingly much stronger than with comparable devices fabricated with polymer synthesized ex situ. Since in this backside architecture setup we illuminate the cell through the Ag top electrode, there is a possibility for Ag plasmon‐enhanced solar energy conversion. By using this simple in situ UV polymerization method that couples the conjugated polymer to the TiO₂ surface, the absorption of sunlight can be improved and the charge carrier mobility of the photoactive layer can be enhanced.     

PbSe纳米晶的制备及在太阳能电池中的应用

基于简单的溶剂注射工艺制备了PbSe纳米晶，利用平均粒径为5nm的PbSe米晶制备了P3HT／PbSeeh,P3HT／PbSe／PCBM两种结构的纳米晶聚合物太阳能电池，P3HT／PbSe电池的最高光电转换效率为O．19％，而基于三相体系P3HT／PbSe／PCBM池的光电转换效率为2．09％，说明PCBM对提高电池的光电转换效率具有重要的作用。     

Ideal Bandgap Organic–Inorganic Hybrid Perovskite Solar Cells

Extremely high power conversion efficiencies (PCEs) of ≈20–22% are realized through intensive research and development of 1.5–1.6 eV bandgap perovskite absorbers. However, development of ideal bandgap (1.3–1.4 eV) absorbers is pivotal to further improve PCE of single junction perovskite solar cells (PVSCs) because of a better balance between absorption loss of sub‐bandgap photons and thermalization loss of above‐bandgap photons as demonstrated by the Shockley–Queisser detailed balanced calculation. Ideal bandgap PVSCs are currently hindered by the poor optoelectronic quality of perovskite absorbers and their PCEs have stagnated at <15%. In this work, through systematic photoluminescence and photovoltaic analysis, a new ideal bandgap (1.35 eV) absorber composition (MAPb_0.5Sn_0.5(I_0.8Br_0.2)₃) is rationally designed and developed, which possesses lower nonradiative recombination states, band edge disorder, and Urbach energy coupled with a higher absorption coefficient, which yields a reduced V_oc,loss (0.45 V) and improved PCE (as high as 17.63%) for the derived PVSCs. This work provides a promising platform for unleashing the complete potential of ideal bandgap PVSCs and prospects for further improvement.     

CdSe纳米晶／MEH—PPV复合型光电池研究

采用单前驱体热解法、高温微乳液法合成了高质量的CdSe纳米晶,将CdSe纳米晶按照一定比例与聚苯乙烯撑（MEH—PPV）共混制成光电池,利用TEM、XRD等研究了纳米晶的形貌结构特征,结果显示,所合成的半导体CdSe纳米晶为闪锌矿结构,直径在3-5nm之间,复合光电池最好的器件能量转化达到0．85％,     

硅/有机杂化太阳电池中PEDOT:PSS改性的研究进展

近年来,硅/PEDO T:PSS杂化太阳电池因其材料成本低廉、制备工艺简单和效率极限高等优点引起了人们的关注和研究.作为空穴选择接触,PEDO T:PSS具备与硅匹配的能带结构,但其电导率低、功函数不理想和成膜质量差等缺点将限制硅/PEDO T:PSS杂化太阳电池的性能.共溶剂、表面活性剂和下转换效应材料等物质的掺杂或后处理可以改善PEDO T:PSS的电导率、成膜质量和光子利用能力等性质.通过上述改性来克服PEDO T:PSS的缺点是提升此类太阳电池性能的一种有效途径.本文介绍了PEDO T:PSS的性质和硅/PEDO T:PSS杂化太阳电池的工作原理,并详细阐述了PEDO T:PSS改性的原理及研究进展,总结了亟待解决的问题并展望了未来的发展趋势.