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G. C. WANG1, L. G. WANG1,* , L. ZHANG1, Y. GUO1, Y. J. WANG1
In this paper, the charge transport and electrical properties in a low bandgap semiconducting polymer poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b’]dithiophene)-alt-4,7-(2,1,3-benzothia-diazole)] (PCPDTBT) are investigated. It is shown that the temperature dependent current density versus voltage characteristics of PCPDTBT hole-only and electron-only devices can be accurately described by using an improved mobility model in which the mobility depends on the temperature, carrier density, and electric field. For the semiconducting polymer studied, we find the width of the Gaussian density of states 0.092 eV for the hole transport and 0.132 eV for the electron transport. Apparently, the electron transport exhibits a significantly stronger energy disorder than the hole transport. This is also reflected in the lower electron mobility (2.43×10−9 m 2 /Vs), as compared to the hole mobility (1.13×10−7 m 2 /Vs). Furthermore, it is shown that the effective mobility in PCPDTBT electron-only device is obviously lower than that in PCPDTBT hole-only device. Both the maximum of carrier concentration and the minimum of electric field appear near the interface of PCPDTBT hole-only and electron-only devices.
Charge transport, Electrical properties, Low bandgap semiconducting polymer.
G. C. WANG, L. G. WANG, L. ZHANG, Y. GUO, Y. J. WANG, Charge transport and electrical properties in a low bandgap semiconducting polymer, Optoelectronics and Advanced Materials - Rapid Communications, 15, 1-2, January-February 2021, pp.86-91 (2021).
Submitted at: Sept. 20, 2020
Accepted at: Feb. 12, 2021
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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