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Highly Efficient Perovskite Solar Cells with Gradient Bilayer Electron Transport Materials
journal contribution
posted on 2018-05-21, 00:00 authored by Xiu Gong, Qiang Sun, Shuangshuang Liu, Peizhe Liao, Yan Shen, Carole Grätzel, Shaik M. Zakeeruddin, Michael Grätzel, Mingkui WangElectron
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.
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F doping levelpower conversion efficiencyperovskiteenergy level alignmentheterojunction PSCsSnO 2 ETLcharge carrier transportdevice V OCF-doped SnO 2 bilayer ETLGradient Bilayer Electron Transport Materials Electron transport layersSnO 2 nanocrystalAM 1.5 G illuminationV OCEfficient Perovskite Solar Cells
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