10.1021/acs.nanolett.8b01440.s001
Xiu Gong
Xiu
Gong
Qiang Sun
Qiang
Sun
Shuangshuang Liu
Shuangshuang
Liu
Peizhe Liao
Peizhe
Liao
Yan Shen
Yan
Shen
Carole Grätzel
Carole
Grätzel
Shaik M. Zakeeruddin
Shaik M.
Zakeeruddin
Michael Grätzel
Michael
Grätzel
Mingkui Wang
Mingkui
Wang
Highly Efficient Perovskite Solar Cells with Gradient
Bilayer Electron Transport Materials
American Chemical Society
2018
F doping level
power conversion efficiency
perovskite
energy level alignment
heterojunction PSCs
SnO 2 ETL
charge carrier transport
device V OC
F-doped SnO 2 bilayer ETL
Gradient Bilayer Electron Transport Materials Electron transport layers
SnO 2 nanocrystal
AM 1.5 G illumination
V OC
Efficient Perovskite Solar Cells
2018-05-21 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Highly_Efficient_Perovskite_Solar_Cells_with_Gradient_Bilayer_Electron_Transport_Materials/6359720
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 (<i>V</i><sub>OC</sub>) and short-circuit current. Herein we systematically investigate
band offset between ETL and perovskite absorber by tuning F doping
level in SnO<sub>2</sub> nanocrystal. We demonstrate that gradual
substitution of F<sup>–</sup> into the SnO<sub>2</sub> ETL
can effectively reduce the band offset and result in a substantial
increase in device <i>V</i><sub>OC</sub>. Consequently,
a power conversion efficiency of 20.2% with <i>V</i><sub>OC</sub> of 1.13 V can be achieved under AM 1.5 G illumination for
planar heterojunction PSCs using F-doped SnO<sub>2</sub> 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 <i>V</i><sub>OC</sub> and charge collection
simultaneously.