期刊
ACS APPLIED NANO MATERIALS
卷 3, 期 11, 页码 11650-11657出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c02890
关键词
porous structure; electron transport layer; niobium oxide; perovskite solar cell; tin iodide; lead-free
资金
- ALCA program [JPMJAL1603]
- Japan Science and Technology Agency (JST)
Sn-based perovskite solar cells have attracted much attention as the lead-free next generation of perovskite solar cells. However, their efficiency is still low (similar to 12%). One reason is that the carrier diffusion length of Sn-based perovskites is shorter than that of Pb-based perovskites. In this study, we investigated the effects of the electron transport layer (ETL) structure, using a porous niobium oxide (Nb2O5) ETL to create a highly efficient Sn-based solar cell. We quantified the effects of the ETL structure on electron extraction efficiency by time-resolved microwave conductivity (TRMC) measurements. From the TRMC and chemical analyses of the materials, we determined that the porous ETL with smaller pores extracts electrons more effectively from the perovskite layer than the porous ETL with larger pores. To realize this, we shortened the distance that photogenerated carriers must move from the perovskite to the ETL for extraction, resulting in less carrier recombination and higher device performance. The small-pore (pore size: 5 nm) nanoporous niobium oxide cell exhibits the highest level of current density (24.0 mA cm(-2)) and solar cell efficiency (7.0%) among the n-i-p structured Sn-based perovskite solar cells. These results demonstrate the importance of ETL structural design for creating highly efficient Sn-based perovskite solar cells.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据