Influence of Top Layer Composition on the Photovoltaic Parameters of P3HT:PCBM Organic Solar Cells

Year 2020, Volume: 24 Issue: 1, 257 - 264, 01.02.2020

Muhammet Erkan Köse

https://doi.org/10.16984/saufenbilder.549216

Abstract

Spin and spray
deposition techniques have been used sequentially to examine the effect of the
composition of top blend layer on the photovoltaic properties of organic solar
cells using well-known poly(3-hexylthiophene):[6,6]-Phenyl C61 butyric acid
methyl ester (P3HT:PCBM) blend. Devices were prepared by spraying an extra
layer of P3HT or PCBM (~15 nm) onto spin coated (1:1) blend film. P3HT-rich top
phase slightly perturbs photovoltaic activity whereas PCBM-rich top phase
drastically changes the power conversion efficiencies with a marked decrease in
fill factors. Carrier mobilities were only marginally affected by the presence
of spray coated top layers. However, series resistance of top phase P3HT-rich
blends remained the same with respect to spin coated sample whereas top phase
PCBM-rich blends exhibit relatively higher series resistances for both annealed
and non-annealed samples. Based on the presented results, one might speculate
that electron injection to cathode with P3HT is almost as efficient as with
PCBM for active layers utilizing P3HT:PCBM blend.

Keywords

organic photovoltaics, morphology, spray coating, P3HT, PCBM

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