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.
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)
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)。
