Highly Efficient Perovskite Solar Cells with Gradient Bilayer Electron Transport Materials

Nano Letters
Xiu GongMingkui Wang

Abstract

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 ( VOC) 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 VOC. Consequently, a power conversion efficiency of 20.2% with VOC 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 VOC and charge collection simultaneously.

References

Apr 16, 2009·Journal of the American Chemical Society·Akihiro KojimaTsutomu Miyasaka
Oct 10, 2012·Journal of the American Chemical Society·Lioz EtgarMichael Grätzel
Nov 2, 2014·Advanced Materials·Brandon R SutherlandEdward H Sargent
Jan 24, 2018·Nature Materials·Jia LinPeidong Yang
Mar 23, 2018·Chemical Society Reviews·Enzheng ShiLetian Dou

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Citations

Sep 27, 2018·Physical Chemistry Chemical Physics : PCCP·Masoud LazemiStefano Bellucci
Mar 19, 2019·ACS Applied Materials & Interfaces·Ruiqian MengYu Tang
Oct 24, 2018·Nano Letters·Jiangsheng LiYuliang Li
Jul 24, 2020·The Journal of Physical Chemistry Letters·Beom-Soo KimHenk J Bolink
Sep 16, 2021·The Journal of Physical Chemistry Letters·Hui WangJianjun Tian
Oct 15, 2021·ACS Applied Materials & Interfaces·Chunyan WangZhang Lan
Dec 7, 2021·ACS Applied Materials & Interfaces·Nianci GuanLin Song

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