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Nanographene–Osmapentalyne Complexes as a Cathode Interlayer in Organic Solar Cells Enhance Efficiency over 18%
Author(s) -
Liu Longzhu,
Chen Shiyan,
Qu Yangyang,
Gao Xiang,
Han Liang,
Lin Zhiwei,
Yang Liulin,
Wang Wei,
Zheng Nan,
Liang Yongye,
Tan Yuanzhi,
Xia Haiping,
He Feng
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202101279
Subject(s) - materials science , organic solar cell , cathode , energy conversion efficiency , photovoltaic system , conjugated system , polymer solar cell , nanotechnology , solar cell , electrode , active layer , charge carrier , layer (electronics) , chemical engineering , optoelectronics , polymer , chemistry , ecology , thin film transistor , composite material , biology , engineering
Abstract Interface engineering is a critical method by which to efficiently enhance the photovoltaic performance of nonfullerene solar cells (NFSC). Herein, a series of metal–nanographene‐containing large transition metal involving d π – p π conjugated systems by way of the addition reactions of osmapentalynes and p ‐diethynyl‐hexabenzocoronenes is reported. Conjugated extensions are engineered to optimize the π‐conjugation of these metal–nanographene molecules, which serve as alcohol‐soluble cathode interlayer (CIL) materials. Upon extension of the π‐conjugation, the power conversion efficiency (PCE) of PM6:BTP‐eC9‐based NFSCs increases from 16% to over 18%, giving the highest recorded PCE. It is deduced by X‐ray crystallographic analysis, interfacial contact methods, morphology characterization, and carrier dynamics that modification of hexabenzocoronenes‐styryl can effectively improve the short‐circuit current density ( J sc ) and fill factor of organic solar cells (OSCs), mainly due to the strong and ordered charge transfer, more matching energy level alignments, better interfacial contacts between the active layer and the electrodes, and regulated morphology. Consequently, the carrier transport is largely facilitated, and the carrier recombination is simultaneously impeded. These new CIL materials are broadly able to enhance the photovoltaic properties of OSCs in other systems, which provides a promising potential to serve as CILs for higher‐quality OSCs.