期刊
NANO LETTERS
卷 18, 期 6, 页码 3969-3977出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b01440
关键词
Doping; electronic material; Fermi level; perovskite; photovoltaic; charge transfer
类别
资金
- NSFC Major International (Regional) Joint Research Project NSFC-SNSF [51661135023]
- Natural Science Foundation of China [21673091]
- Natural Science Foundation of Hubei Province [ZRZ2015000203]
- Technology Creative Project of Excellent Middle & Young Team of Hubei Province [T201511]
- King Abdulaziz City for Science and Technology (KACST)
Electron transport layers (ETLs) with suitable energy level alignment for facilitating charge carrier transport as well as electron extraction are essential for planar heterojunction perovskite solar cells (PSCs) to achieve high open-circuit voltage (V-oc) and short-circuit current. Herein we systematically investigate band offset between ETL and perovskite absorber by tuning F doping level in SnO2 nanocrystal. We demonstrate that gradual substitution of F- into the SnO2 ETL can effectively reduce the band offset and result in a substantial increase in device V-oc. Consequently, a power conversion efficiency of 20.2% with V-oc of 1.13 V can be achieved under AM 1.5 G illumination for planar heterojunction PSCs using F-doped SnO2 bilayer ETL. Our finding provides a simple pathway to tailor ETL/perovskite band offset to increase built-in electric field of planar heterojunction PSCs for maximizing V-oc and charge collection simultaneously.
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