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

Authors : Muhammet Erkan KÖSE

Pages : 257-264

Doi:10.16984/saufenbilder.549216

View : 36 | Download : 12

Publication Date : 2020-02-01

Article Type : Research Paper

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 polyinsert ignore into journalissuearticles values(3-hexylthiophene);:[6,6]-Phenyl C61 butyric acid methyl ester insert ignore into journalissuearticles values(P3HT:PCBM); blend. Devices were prepared by spraying an extra layer of P3HT or PCBM insert ignore into journalissuearticles values(~15 nm); onto spin coated insert ignore into journalissuearticles values(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