The effect of oxygen on the efficiency of planar p-i-n metal halide perovskite solar cells with a PEDOT:PSS hole transport layer

Journal of Materials Chemistry. A, Materials for Energy and Sustainability
Bardo J BruijnaersRené A J Janssen

Abstract

Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is frequently used as hole transport layer in planar p-i-n perovskite solar cells. Here we show that processing of a metal halide perovskite layer on top of PEDOT:PSS via spin coating of a precursor solution chemically reduces the oxidation state of PEDOT:PSS. This reduction leads to a lowering of the work function of the PEDOT:PSS and the perovskite layer on top of it. As a consequence, the solar cells display inferior performance with a reduced open-circuit voltage and a reduced short-circuit current density, which increases sublinearly with light intensity. The reduced PEDOT:PSS can be re-oxidized by thermal annealing of the PEDOT:PSS/perovskite layer stack in the presence of oxygen. As a consequence, thermal annealing of the perovskite layer in air provides solar cells with increased open-circuit voltage, short-circuit current density and high efficiency.

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Citations

Nov 21, 2019·Chemical Communications : Chem Comm·Jie DouMingdeng Wei
Mar 7, 2020·Chemistry : a European Journal·Miriam Más-MontoyaRené A J Janssen
Jan 15, 2021·Journal of Hazardous Materials·Zhengyou ZhuLei Wang
Sep 17, 2019·ACS Applied Materials & Interfaces·Jie DouMingdeng Wei
Jan 4, 2022·Chemical Communications : Chem Comm·Sujitkumar BontapalleKyoseung Sim

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