Band alignment towards high-efficiency NiOx-based Sn-Pb mixed perovskite solar cells  

基于能带工程制备氧化镍基底的高效锡-铅共混钙钛矿太阳能电池

作　　者：Hao Chen Zijian Peng Kaimin Xu Qi Wei Danni Yu Congcong Han Hansheng Li Zhijun Ning 陈昊;彭子键;徐凯敏;魏旗;虞丹妮;韩聪聪;李晗升;宁志军(School of Physical Science and Technology,ShanghaiTech University,Shanghai,201210,China;Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,200050,China;School of Chemistry and Chemical Engineering,University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]School of Physical Science and Technology,ShanghaiTech University,Shanghai,201210,China [2]Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,200050,China [3]School of Chemistry and Chemical Engineering,University of Chinese Academy of Sciences,Beijing,100049,China

出　　处：《Science China Materials》2021年第3期537-546,共10页中国科学（材料科学（英文版）

基　　金：the National Key Research and Development Program of China(2016YFA0204000);the National Natural Science Foundation of China(61935016,U1632118 and 21571129);start-up funding from ShanghaiTech University;the Center for High-resolution Electron Microscopy(C?EM)at ShanghaiTech University(EM02161943);Young 1000 Talents Program;Science Fund for Creative Research Groups(21421004)。

摘　　要：Narrow-bandgap tin-lead(Sn-Pb)mixed perovskite solar cells(PSCs)play a key role in constructing perovskite tandem solar cells that are potential to overpass Shockley-Queisser limit.A robust,chemically stable and lowtemperature-processed hole transporting layer(HTL)is essential for building high-efficiency Sn-Pb solar cells and perovskite tandem solar cells.Here,we explore a roomtemperature-processed NiOx(L-NiOx)HTL based on nanocrystals(NCs)for Sn-Pb PSCs.In comparison with hightemperature-annealed NiOx(H-NiOx)film,the L-NiOx film shows deeper valence band and lower trap density,which increases the built-in potential and reduces carrier recombination,leading to a power conversion efficiency of 18.77%,the record for NiOx-based narrow-bandgap PSCs.Furthermore,the device maintains about 96%of its original efficiency after 50 days.This work provides a robust and room-temperatureprocessed HTL for highly efficient and stable narrow-bandgap PSCs.钙钛矿叠层太阳能电池因为具有超过肖克利-奎伊瑟效率极限的潜力而备受关注.窄带隙锡-铅(Sn-Pb)共混钙钛矿太阳能电池(PSCs)在钙钛矿叠层太阳能电池的构建中起着关键作用.制备稳定性好、可低温处理的空穴输送层是构建高效Sn-Pb钙钛矿太阳能电池和钙钛矿叠层太阳能电池的关键.在此,我们开发了一种室温处理的纳米晶体氧化镍(L-NiOx)作为空穴传输层用于Sn-Pb共混钙钛矿太阳能电池结构.相比于高温烧结的氧化镍(H-NiOx)薄膜,L-NiOx表现出较深的价带和较低的陷阱密度,这增大了内建电势和减少了载流子的复合,使器件的功率转换效率达到了18.77%,这是基于NiOx空穴传输层的窄带隙Sn-Pb钙钛矿太阳能电池的最高效率.此外,该器件的效率在50天后仍能保持原有效率的96%,具有非常好的稳定性.这项工作为高效稳定窄带隙PSCs提供了一种可在室温下制备的无机空穴传输材料.

关 键 词：band alignment NIOX Sn-Pb mixed perovskite solar cell 

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]