High glass transition temperature dopant-free hole transport material via D-A-π-A-D-strategy for perovskite solar cell  

作　　者：Cheng-Hui Liao Li-Gang Yuan Yi-Heng Zhang Wei-Ya Zhu Min-Chao Qin Zhi-Bo He Jie-Lin Huang Hao-Lin Xiao Zhi-Heng Li Xin-Hui Lu Ke-You Yan Yuan Li 

机构地区：[1]State Key Laboratory of Luminescent Materials and Devices,Institute of Polymer Optoelectronic Materials and Devices,School of Materials Science and Engineering,South China University of Technology,Guangzhou,510640,China [2]School of Environment and Energy,State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling,South China University of Technology,Guangzhou,510000,China [3]Department of Physics,The Chinese University of Hong Kong,Hong Kong,999077,China

出　　处：《Rare Metals》2024年第12期6373-6383,共11页稀有金属(英文版)

基　　金：financially supported by the Natural Science Foundation of China(Nos.51973063 and 22375065)。

摘　　要：Despite the great leap forward perovskite solar cells(PSCs)have achieved in power conversion efficiency,the device instability remains one of the major problems plaguing its commercialization.Dopant-free hole transport material(HTM)has been widely studied as an important strategy to improve the stability of PSCs due to its avoidance of moisture-sensitive dopants and cumbersome doping process.In this work,a series of dopant-free HTMs L1F,L2F and L3F based on D-A-π-A-D configuration were synthesized through two steps of reaction.L3F presents a high glass transition temperature of 1800C and thermal decomposition temperature of 4480C.Notably,electron paramagnetic resonance signals of L1F,L2F and L3F powders indicate the open-shell quinoidal diradical resonance structure in their aggregation state due to aggregation-induced radical effect.All these HTMs present higher hole mobility than dopant-free Spiro-OMeTAD,and the dopant-free L3F-based PSC device achieves the highest power conversion efficiency of 17.6%among them.In addition,due to the high hydrophobic properties of L1F,L2F and L3F,the perovskite films spin-coated with these HTMs exhibit higher humidity stability than doped SpiroOMeTAD.These results demonstrate a promising design strategy for high glass transition temperature dopant-free hole transport material.The open-shell quinoid-radical organic semiconductors are not rational candidates for dopant-free HTMs for PSC devices.

关 键 词：Perovskite solar cells Dopant-free Hole transport materials D-A-π-A-D High glass transition temperature 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB34[一般工业技术—材料科学与工程]