异质结
光电效应
材料科学
钙钛矿(结构)
光电子学
范德瓦尔斯力
单层
类型(生物学)
Atom(片上系统)
纳米技术
化学
结晶学
计算机科学
生物
嵌入式系统
有机化学
分子
生态学
作者
Cheng-Sheng Liao,Zhuo‐Liang Yu,Peng-Bin He,Yu‐Qing Zhao,Biao Liu,Meng‐Qiu Cai
标识
DOI:10.1016/j.jpowsour.2020.229078
摘要
Constructing perovskite-based van der Waals heterostructures (vdWHs) have rapidly advanced the field of optoelectronics and solar cells due to their unprecedented property to integrate excellent characteristics of different materials. In general, the perovskite-based vdWHs have various functional properties due to their different band alignments for Type I, Type II and Type III. However, it is challenging to realize the flexible switch of band alignments in heterostructure for diverse applications. In this paper, we systematically investigate the electronic and optical properties of novel heterostructure system composed of emerging two-dimensional material Pd2Se3 and all-inorganic halide perovskite CsSnBr3 for the first time. A Type I–Type II transition of band alignments in Pd2Se3/CsSnBr3 vdWH is achieved by partly replacing the Pd atom in Pd2Se3 monolayer with Ni atom, facilitating the highly efficient separation of photo-generated carriers. Meanwhile, the heavy hole effective mass along [1 0 0] direction is greatly reduced due to the transition of band alignment, which will improve the photoelectric conversion efficiency. Our works indicate that such a controllable band alignment of Pd2Se3/CsSnBr3 heterostructure holds a significant potential for future photoelectric applications.
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