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G. C. WANG1, L. G. WANG1,* , L. ZHANG1, Y. GUO1, B. B. CUI1
- School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo, 454000, People’s Republic of China
In this paper, the electron transport and energetic disorder in photovoltaic blends of P3HT and a series of bisadduct analogues of PCBMs and their thienyl versions have been studied. It is shown that the current density versus voltage characteristics of electron-only devices of all P3HT:fullerene blends can be accurately described using our recently introduced improved mobility model. The occurrence of a multitude of different isomers results in a decrease in the electron transport for these blends, and the charge-carrier mobility is closely related to the energetic disorder. Furthermore, it is shown that the mobility in P3HT:fullerene blends is carrier concentration dependent, and the effective mobility in a P3HT:fullerene blend device with higher multitude of isomers fullerene phase is obviously lower than that in a P3HT:fullerene blend device with lower multitude of isomers fullerene phase. Both the maximum of carrier concentration and the minimum of electric field appear near the interface of P3HT:fullerene blend electron-only devices. These results suggest that the amount of energetic disorder appears to govern the charge carrier transport in polymer:fullerene blends..
Electron transport, Energetic disorder, Polymer:fullerene blends.
Submitted at: Aug. 31, 2020
Accepted at: Feb. 15, 2021
G. C. WANG, L. G. WANG, L. ZHANG, Y. GUO, B. B. CUI, Electron transport and energetic disorder in polymer:bisadduct fullerene photovoltaic blends, Journal of Optoelectronics and Advanced Materials Vol. 23, Iss. 1-2, pp. 29-34 (2021)
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