D^(6h)Symmetric Radical Donor-Acceptor Nanographene Modulated Interfacial Carrier Transfer for High-Performance Perovskite Solar Cells  

作　　者：Can Wang Yifeng Gao Zhen-Lin Qiu Ping-Ping Sun Naoyuki Shibayama Zilong Zhang Qiu Xiong Fangbin Ren Shui-Yang Lien Lusheng Liang Jiaoxia Zhang Yuan-Zhi Tan Peng Gao 

机构地区：[1]CAS Key Laboratory of Design and Assembly of Functional Nanostructures,Fujian Provincial Key Laboratory of Nanomaterials,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,Fujian 350002 [2]Laboratory for Advanced Functional Materials,Xiamen Institute of Rare Earth Materials,Haixi Institute,Chinese Academy of Sciences,Xiamen 361021 [3]University of Chinese Academy of Sciences,Beijing 100049 [4]School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003 [5]Collaborative Innovation Center of Chemistry for Energy Materials,State Key Laboratory for Physical Chemistry of Solid Surfaces,Engineering Research Center for Nano-Preparation Technology of Fujian Province,Department of Chemistry,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005 [6]Department of Chemistry,School of Science,Hainan University,Haikou 570228 [7]Faculty of Biomedical Engineering,Graduate School of Engineering,Toin University of Yokohama,Yokohama,Kanagawa 225-8503 [8]Xiamen University of Technology,Xiamen 361024

出　　处：《CCS Chemistry》2023年第9期2159-2170,共12页中国化学会会刊（英文）

基　　金：the financial support from the National Natural Science Foundation of China(grant nos.21975260 and 22175180);the National Natural Science Foundation of China-National Research Council of Italy(NSFC-CNR)Exchange Program of NSFC(grant no.22011530391);The GIWAXS measurements were performed at SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute(grant nos.2022A1654,2022A1777,and 2022A1822).

摘　　要：Imbalanced charge-carrier extraction remains an issue aggravating interfacial charge accumulation and recombination.More hopping transport channels could accelerate the extraction of charge.Here,we demonstrated an effective“bridging interface”strategy between the perovskite/2,2′,7,7′-tetrakis(N,N-di-pmethoxyphenylamine)-9,9′-spirobifluorene(spiro-OMeTAD)that modulates interfacial charge transfer and improves hole mobility using radical-containing donor-acceptor nanographenes(D-A NGs)possessing electron-deficient perchlorinated NGs and electron-rich aniline derivatives.The fully delocalized backbone of nanographene formed a conjugated bridge for intermolecular charge transfer and generated stable radical cations,verified by electron spin resonance.Lamellar andπ-πstacking orientation of D-A NGs also provided advantageous hopping transport channels.Besides favorable charge transfer within D-A NGs,systematic explorations indicated a strong interface coupling and noticeable charge transfer across the D-A NGs and perovskite interface,where electrons would flow from D-A NGs to perovskite,and holes would flow from perovskite to D-A NGs.Moreover,the hole mobility of spiro-OMeTAD was also enhanced because the D-A NGs would diffuse into the spiro-OMeTAD layer.As a result,planar n-i-p perovskite solar cellsmodified byD-ANG-OMe/D-ANG-tBudeliveredchampion power conversion efficiencies(PCEs)of 23.25%and 23.51%,respectively.

关 键 词：perovskite solar cell RADICALS donor-acceptor nanographene hole mobility interfacial charge transfer 

分 类 号：TM914.4[电气工程—电力电子与电力传动]