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Structure influence of alkyl chains of thienothiophene-porphyrins on the performance of organic solar cells

Materials Reports(Energy) 2021年第4期1卷 61-67页

作者： Liuping Xie Zhixin Liu Wei Tang Xiaote He Fengbing Zhai Zihao Yuan Song Chen Xuan Zhou Lei Yan Xunjin Zhu Xingzhu Wang College of Chemistry School of Physics and OptoelectronicsXiangtan UniversityXiangtan 411105HunanPR China Department of Chemistry and Institute of Advanced Materials Hong Kong Baptist UniversityWaterloo RoadKowloon TongHong KongPR China Academy for Advanced Interdisciplinary Research and Department of Materials Science&Engineering Southern University of Science and TechnologyShenzhenGuangdong 518055PR China

Two new A-D-A porphyrin derivatives,denoted as XLP-I and XLP-II,were prepared through extending theπ-conjugation of thienothiophene-porphyrin center with phenylethynyl bridges and electron-deficient ethylrhodanine terminal units,and varying the structures of alkyl chain(linear vs branched)on peripheral thienothiophene substitutions of porphyrin *** molecules show strong absorption in UV–visible–near-infrared region,good thermal stability,suitable energy levels,and ordered molecular packing in solid *** organic solar cells,PC71BM was used as electron acceptor,and porphyrin small molecules were used as electron *** device based on XLP-I exhibits a power conversion efficiency(PCE)of 8.30%,an open circuit voltage(Voc)of 0.894 eV,and a fill factor(FF)of 62.1%.In contrast,the device based on XLP-II presents an inferior performance with a PCE of 3.14%,a Voc of 0.847 eV,and a FF of 49.3%.The better performance of XLP-I based device is mainly attributed to its optimized film morphology,excellent absorption,and well-balanced charge transport properties.

关键词： Thienothiophene Porphyrin small molecular donor Linear alkyl chain Branched alkyl chain

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High-performance organic solar cells based on polymer donor/small molecule donor/nonfullerene acceptor ternary blends

High-performance organic solar cells based on polymer donor/...

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第六届新型太阳能电池材料科学与技术学术研讨会

作者： Dai Shuixing Lu Bing Zhan Xiaowei College of Engineering Peking University

We first reported the small molecule donor/polymer donor/nonfullerene acceptor ternary OSCs, which achieved a power conversion efficiency over 13%. The results showed that(1) TR is totally mixed with PTB7-Th and efficient energy transfer to PTB7-Th,(2) TR enhanced the charge mobility of PTB7-Th blend,(3) Transient absorption spectroscopy confirms the importance of long-range resonant energy transfer from PTB7-Th to FOIC.

关键词： ternary blend non-fullerene small molecular donor organic solar cells

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