TITLE:
Perovskite Self-Passivation with PCBM for Small Open-Circuit Voltage Loss
AUTHORS:
Xinglin Zhu, Xinyu Zhao, Lei Li, Yi Peng, Wenwang Wei, Xuan Zhang, Mengwei Su, Yukun Wang, Ziqian Chen, Wenhong Sun
KEYWORDS:
Self-Passivation, Small Open-Circuit Voltage Loss, PCBM
JOURNAL NAME:
Energy and Power Engineering,
Vol.12 No.6,
June
12,
2020
ABSTRACT: It is well known that [6,6]-phenyl-C61-butyric acid methyl
ester (PCBM) is a common n-type passivation material in PSCs, usually used as
an interface modification layer. However, PCBM is extremely expensive and is
not suitable for future industrialization. Herein, the various concentrations
of PCBM as an additive are adopted for PSCs. It not only avoids the routine
process of spin coating the multi-layer films, but also reduces the PCBM
material and cost. Meanwhile, PCBM can passivate the grain surface and modulate
morphology of perovskite films. Furthermore, the most important optical
parameters of solar cells, the current density (Jsc), fill factor (FF), open-circuit voltage (Voc) and power conversion
efficiencies (PCE) were improved. Especially, when the PCBM doping ratio in CH3NH3PbI3 (MAPbI3) precursor solution was 1 wt%,
the device obtained the smallest Voc decay (less than 1%) in the p-i-n type PSCs with poly (3,4-ethylenedioxythiophene):poly
(styrene sulfonate) (PEDOT:PSS) as hole transport layer (HTL) and fullerene (C60)
as electron transport layer (ETL). The PSCs Voc stability improvement is attributed to
enhanced crystallinity of photoactive layer and decreased non-radiative recombination
by PCBM doping in the perovskites.