材料科学
带隙
光电子学
接受者
开路电压
共聚物
聚合物
共轭体系
太阳能电池
能量转换效率
聚合物太阳能电池
光伏系统
猝灭(荧光)
化学工程
电压
光学
复合材料
荧光
电气工程
物理
工程类
凝聚态物理
作者
Ji Hyun Lee,Chang-Geun Park,Aesun Kim,Hyung-Jong Kim,Youngseo Kim,Sungnam Park,Min Ju Cho,Donghoon Choi
标识
DOI:10.1021/acsami.8b03580
摘要
We synthesized a novel fully conjugated block copolymer, P3, in which a wide-band gap donor block (P1) was connected to a narrow-band gap acceptor block (P2). As P3 contains P1 block with a wide bandgap and P2 block with a narrow bandgap, it exhibits a very wide complementary absorption. Transient photoluminescence measurement using P3 dilute solution demonstrated intramolecular charge transfer between the P1 block and the P2 block, which was not observed in a P1/P2 blend solution. A P3 thin film showed complete PL quenching because the photoinduced inter-/intramolecular charge transfer states were effectively formed. This phenomenon can play an important role in the photovoltaic properties of P3-based polymer solar cells. A single active material polymer solar cell (SAMPSC) fabricated from P3 alone exhibited a high power conversion efficiency (PCE) of 3.87% with a high open-circuit voltage of 0.93 V and a short-circuit current of 8.26 mA/cm2, demonstrating a much better performance than a binary P1-/P2-based polymer solar cell (PCE = 1.14%). This result facilitates the possible improvement of the photovoltaic performance of SAMPSCs by inducing favorable nanophase segregation between p- and n blocks. In addition, owing to the high morphological stability of the block copolymer, excellent shelf-life was observed in a P3-based SAMPSC compared with a P1/P2-based PSC.
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