摘要
有机太阳能电池(OPV),具有质量轻、可成本低制备等优势,是一种具有实际应用潜力的光伏技术。有机太阳能电池活性层可以由共轭聚合物或溶液可加工的小分子材料(给体与受体)共混组成。由于小分子材料具有明确的分子结构,纯度可控及无批次差别影响的特点;并结合近年来非富勒烯小分子受体的快速发展,使得非富勒烯全小分子(NF-SM-OPV)电池研究受到广泛关注。由于大部分A-D-A型非富勒烯受体分子具有各向异性的特点,这使激子解离和电荷传输,很大程度上受分子间堆积方式的影响,导致非富勒烯全小分子电池活性层形貌调控更加复杂。虽然非富勒烯小分子太阳能电池具有非富勒烯受体材料和小分子材料的双重优势,但高效率非富勒烯小分子太阳能电池的制备,仍具有很大挑战。因此,本文总结近年来高性能非富勒烯小分子太阳能电池的相关进展。着重介绍针对非富勒烯受体的给体小分子材料设计工作,并在此基础上近一步讨论非富勒烯小分子太阳能电池面临的挑战与展望。
Solution-processed bulk-heterojunction organic solar cells(BHJOSCs),with their advantages of light weight,low cost,and easy fabrication,are a photovoltaic technology with practical potentials.In BHJ-OSCs,the exciton dissociation and charge transport are highly sensitive to the molecular packing pattern and phase separation morphology in the active layer.On the other hand,when using photovoltaic small molecules(SMs),the purity can be controlled due to their well-defined chemical structure,and therefore there is better reproducibility in device performance.Especially,the non-fullerene acceptors are easier to tune in their light absorption and energy level.Hence,there has been considerable interest in small non-fullerene SM organic solar cells(NF-SM-OSCs).Although these cells have the dual advantages of non-fullerene acceptor materials and SMs,the fabrication of high-efficiency cells still possess great challenges.For example,efficient photovoltaic SMs typically possess an acceptor-donor-acceptor(AD-A)structure that causes intrinsic anisotropy,making it more complicated to modulate and control the morphology of the nanoscale active layer.In this article,we will summarize recent advances in high-performance NF-SM-OSCs,and present an introduction of the specific requirements for SM donors in the small NF-SM-OSCs.We first summarize our works on SM donors with the A-D-A structure.The trialkylthienyl-substituted benzodithiophene(TriBDT-T)unit is employed as the D-core unit,and the A end groups include rhodanine(RN),cyano-rhodanine(RCN),and 1,3-indanone(IDO).The band gap(Eg)of these compounds is about 2.0 eV,with the low-lying highest occupied molecular orbital(HOMO)level of?5.51 eV.First,NF-SM-OSCs with DRTB-T and a non-fullerene acceptor(IDIC)were constructed.The morphology of the active layer was fine-tuned by solvent vapor annealing(SVA),leading to the formation of the desired interconnected nanoscale structure.Our results demonstrate that the molecular design of a wide band gap(WBG)donor to create a well-matched dono
作者
何畅
侯剑辉
HE Chang;HOU Jianhui(State Key Laboratory of Polymer Physics and Chemistry,Beijing National Laboratory for Molecular Sciences,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,P.R.China)
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2018年第11期1202-1210,共9页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(521734008)资助项目。
关键词
有机太阳能电池
溶液可加工
非富勒烯受体
宽带隙小分子
本体异质结
Organic photovoltaic cells
Solution-processible
Non-fullerene acceptor
Wide bandgap small molecule
Bulk-heterojunction
