Hydroxylated non-fullerene acceptor for highly efficient inverted perovskite solar cells†

IF 32.4 1区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Qing Yang, Xuan Liu, Shuwen Yu, Zhendong Feng, Lixin Liang, Wei Qin, Youyang Wang, Xiaobo Hu, Shaoqiang Chen, Zhaochi Feng, Guangjin Hou, Kaifeng Wu, Xin Guo and Can Li
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引用次数: 6

Abstract

Inverted perovskite solar cells (i-PSCs) manifest negligible hysteresis and potential to construct tandem solar cells attracting much attention, but their power conversion efficiency (PCE) still lags behind those of conventional ones due to non-radiative recombination from defect states and mismatched energy-level alignment for electron transport. Herein, we report on employing a hydroxylated non-fullerene acceptor (NFA), termed IT-DOH, to modify the interface between the perovskite and the electron transport layer (ETL) for reduced defects and improved electron transport. Compared with –CN and –CO groups in the parent molecule ITIC, additional –OH groups in IT-DOH can further suppress defect states by interacting with undercoordinated Pb2+. More importantly, the conjugated planes of IT-DOH can be elongated by intermolecular hydrogen-bonding interactions, leading to a long-range-ordered molecular arrangement and face-on orientation, which facilitates the electron transport from the perovskite to the ETL through IT-DOH molecules. Consequently, a record PCE of 22.09% among reported i-PSCs modified by NFAs is achieved from IT-DOH-treated i-PSCs. Our work highlights the importance of molecular ordering and orientation of the NFAs as interfacial materials, and provides a guideline to design NFAs by hydroxylation for highly efficient and stable i-PSCs.

Abstract Image

高效倒置钙钛矿太阳能电池的羟基化非富勒烯受体†
倒置钙钛矿太阳能电池(i-PSCs)具有可忽略不计的滞后和构建串联太阳能电池的潜力,但由于缺陷态的非辐射重组和电子输运的能级排列不匹配,其功率转换效率(PCE)仍然落后于传统电池。在此,我们报告了采用羟基化非富勒烯受体(NFA),称为IT-DOH,来修饰钙钛矿和电子传输层(ETL)之间的界面,以减少缺陷和改善电子传输。与母体分子ITIC中的-CN和-CO基团相比,IT-DOH中附加的-OH基团可以通过与欠配位Pb2+相互作用进一步抑制缺陷态。更重要的是,IT-DOH的共轭平面可以通过分子间的氢键相互作用被拉长,导致分子的长范围有序排列和面朝取向,这有利于电子通过IT-DOH分子从钙钛矿转移到ETL。因此,经it - doh处理的i-PSCs中,经nfa修饰的i-PSCs的PCE达到创纪录的22.09%。我们的工作强调了nfa分子的有序和取向作为界面材料的重要性,并为通过羟基化设计高效稳定的i- psc的nfa提供了指导。
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来源期刊
Energy & Environmental Science
Energy & Environmental Science 化学-工程:化工
CiteScore
50.50
自引率
2.20%
发文量
349
审稿时长
2.2 months
期刊介绍: Energy & Environmental Science, a peer-reviewed scientific journal, publishes original research and review articles covering interdisciplinary topics in the (bio)chemical and (bio)physical sciences, as well as chemical engineering disciplines. Published monthly by the Royal Society of Chemistry (RSC), a not-for-profit publisher, Energy & Environmental Science is recognized as a leading journal. It boasts an impressive impact factor of 8.500 as of 2009, ranking 8th among 140 journals in the category "Chemistry, Multidisciplinary," second among 71 journals in "Energy & Fuels," second among 128 journals in "Engineering, Chemical," and first among 181 scientific journals in "Environmental Sciences." Energy & Environmental Science publishes various types of articles, including Research Papers (original scientific work), Review Articles, Perspectives, and Minireviews (feature review-type articles of broad interest), Communications (original scientific work of an urgent nature), Opinions (personal, often speculative viewpoints or hypotheses on current topics), and Analysis Articles (in-depth examination of energy-related issues).
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