High-Performance Perovskite Quantum Dot Solar Cells Enabled by Incorporation with Dimensionally Engineered Organic Semiconductor  

作　　者：Seyeong Lim Dae Hwan Lee Hyuntae Choi Yelim Choi Dong Geon Lee Sung Beom Cho Seonkyung Ko Jongmin Choi Younghoon Kim Taiho Park 

机构地区：[1]Department of Chemical Engineering,Pohang University of Science and Technology(POSTECH),Pohang 37673,Republic of Korea [2]Department of Materials Science and Engineering,Hanyang University,Seoul 04763,Republic of Korea [3]Center of Materials Digitalization,Korea Institute of Ceramic Engineering and Technology(KICET),Jinju 52851,Republic of Korea [4]Department of Materials Science and Engineering,Ajou University,Suwon 16499,Republic of Korea [5]Department of Energy Science and Engineering,Daegu Gyeongbuk Institute of Science and Technology(DGIST),Daegu 42988,Republic of Korea [6]Department of Chemistry,Kookmin University,Seoul 02707,Republic of Korea

出　　处：《Nano-Micro Letters》2022年第12期272-285,共14页纳微快报（英文版）

基　　金：This work was supported by National Research Foundation of Korea(NRF)grants funded by Ministry of Science and ICT(MSIT)(Nos.2021R1A2C3004420,2022M3J1A1085282,2020R1C1C1012256 and 2020R1C1C1003214);the NRF of Korea grant funded by the Korean Government(NRF-2019-Global Ph.D.Fellowship Program.

摘　　要：Perovskite quantum dots(PQDs)have been considered promising and effective photovoltaic absorber due to their superior optoelectronic properties and inherent material merits combining perovskites and QDs.However,they exhibit low moisture stability at room humidity(20-30%)owing to many surface defect sites generated by inefficient ligand exchange process.These surface traps must be re-passivated to improve both charge transport ability and moisture stability.To address this issue,PQD-organic semiconductor hybrid solar cells with suitable electrical properties and functional groups might dramatically improve the charge extraction and defect passivation.Conventional organic semiconductors are typically low-dimensional(1D and 2D)and prone to excessive self-aggregation,which limits chemical interaction with PQDs.In this work,we designed a new 3D star-shaped semiconducting material(Star-TrCN)to enhance the compatibility with PQDs.The robust bonding with Star-TrCN and PQDs is demonstrated by theoretical modeling and experimental validation.The Star-TrCN-PQD hybrid films show improved cubic-phase stability of CsPbI_(3)-PQDs via reduced surface trap states and suppressed moisture penetration.As a result,the resultant devices not only achieve remarkable device stability over 1000 h at 20-30%relative humidity,but also boost power conversion efficiency up to 16.0%via forming a cascade energy band structure.

关 键 词：CsPbI3 quantum dots Star-shaped organic semiconductors Hybrid perovskite quantum dots Solar cell stability High-efficiency photovoltaics 

分 类 号：TB30[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]