Self-assembled donor-acceptor hole contacts for inverted perovskite solar cells with an efficiency approaching 22%: The impact of anchoring groups

作     者：Qiaogan Liao Yang Wang Zilong Zhang Kun Yang Yongqiang Shi Kui Feng Bolin Li Jiachen Huang Peng Gao Xugang Guo Qiaogan Liao;Yang Wang;Zilong Zhang;Kun Yang;Yongqiang Shi;Kui Feng;Bolin Li;Jiachen Huang;Peng Gao;Xugang Guo

作者机构：Department of Materials Science and EngineeringGuangdong Provincial Key Laboratory of Functional Oxide Materials and DevicesSouthern University of Science and Technology(SUSTech)Shenzhen 518055GuangdongChina College of MaterialsFujian Key Laboratory of Advanced MaterialsXiamen UniversityXiamen 361005FujianChina CAS Key Laboratory of Design and Assembly of Functional NanostructuresFujian Provincial Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002FujianChina School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2022年第31卷第5期

页      面：87-95页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0702[理学-物理学] 

基　　金：financial support from the National Natural Science Foundation of China (NSFC)(21805128) the National Natural Science Foundation of China (21774055) the financial support from the National Natural Science Foundation of China(21975260) the Shenzhen Science and Technology Innovation Commission(JCYJ20180504165709042) financial support of Guangdong Provincial Key Laboratory Program(2021B1212040001) from the Department of Science and Technology of Guangdong Province the NSFC-CNR exchange program of NSFC(22011530391)。 

主　　题：Self-assembled molecules Donor-acceptor backbones Hole contacts Perovskite solar cells Anchoring groups 

摘      要：Self-assembled molecules(SAMs) have shown great potential in replacing bulk charge selective contact layers in high-performance perovskite solar cells(PSCs) due to their low material consumption and simple processing. Herein, we design and synthesize a series of donor-acceptor(D-A) type SAMs(MPA-BTCA, MPA-BT-BA, and MPA-BT-RA, where MPA is 4-methoxy-N-(4-methoxyphenyl)-N-phenylaniline;BT is benzo[c][1,2,5]-thiadiazole;CA is 2-cyanoacrylic acid, BA is benzoic acid, RA is rhodanine-3-propionic acid) with distinct anchoring groups, which show dramatically different properties. MPA-BTCA with CA anchoring groups exhibited stronger dipole moments and formed a homogeneous monolayer on the indium tin oxide(ITO) surface by adopting an upstanding self-assembling mode. However, the MPA-BT-RA molecules tend to aggregate severely in solid state due to the sp~3 hybridization of the carbon atom on the RA group, which is not favorable for achieving a long-range ordered self-assembled layer.Consequently, benefiting from high dipole moment, as well as dense and uniform self-assembled film,the device based on MPA-BT-CA yielded a remarkable power conversion efficiency(PCE) of 21.81%.Encouragingly, an impressive PCE approaching 20% can still be obtained for the MPA-BT-CA-based PSCs as the device area is increased to 0.80 cm^(2). Our work sheds light on the design principles for developing hole selecting SAMs, which will pave a way for realizing highly efficient, flexible, and large-area PSCs.