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Download fileEffective Strategy to Improve Contact Selectivity in Organic Solar Cells
journal contribution
posted on 28.10.2021, 18:10 authored by Hui Jin, Xiaoyun Xu, Hongbo Wu, Zaifei Ma, Zheng TangImproving
the contact selectivity is an effective approach to reduce
the non-radiative recombination voltage loss caused by charge carrier
diffusion in organic solar cells. A surface modification strategy
based on the use of the fullerene-selective solvent 1,8-diiodooctane
(DIO) is proposed to improve the contact selectivity of organic solar
cells. We observe that the fullerene molecules in the binary polymer–fullerene
active layers or the ternary active layers containing both fullerene
and non-fullerene acceptors are extracted to the surface after the
DIO treatment. As a result, a dense fullerene layer, highly selective
for electrons, is created at the cathode interface of the solar cell.
The increased cathode selectivity gives rise to reduced diffusion
loss of charge carriers, suppressed non-radiative recombination voltage
loss, increased open-circuit voltage, and thus, the improved photovoltaic
performance of the solar cell.
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Keywords
reduced diffusion lossimproved photovoltaic performanceselective solvent 1organic solar cellscharge carrier diffusiondense fullerene layerimprove contact selectivitycontact selectivitysolar cellhighly selectivecharge carriersincreased openfullerene moleculesfullerene acceptorseffective strategyeffective approachcircuit voltagecathode interface