TY - JOUR
T1 - The effect of oxygen on the efficiency of planar p-i-n metal halide perovskite solar cells with a PEDOT
T2 - PSS hole transport layer
AU - Bruijnaers, Bardo J.
AU - Schiepers, Eric
AU - Weijtens, Christ H.L.
AU - Meskers, Stefan C.J.
AU - Wienk, Martijn M.
AU - Janssen, René A.J.
PY - 2018/4/28
Y1 - 2018/4/28
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85045963444&partnerID=8YFLogxK
U2 - 10.1039/c7ta11128b
DO - 10.1039/c7ta11128b
M3 - Article
C2 - 30009025
AN - SCOPUS:85045963444
VL - 6
SP - 6882
EP - 6890
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
SN - 2050-7488
IS - 16
ER -