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Open AccessArticle

Photovoltage Reversal in Organic Optoelectronic Devices with Insulator-Semiconductor Interfaces

1
School of Information Science and Technology, Fudan University, Shanghai 200433, China
2
Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(9), 1530; https://doi.org/10.3390/ma11091530
Received: 31 May 2018 / Revised: 4 August 2018 / Accepted: 21 August 2018 / Published: 25 August 2018
Photoinduced space-charges in organic optoelectronic devices, which are usually caused by poor mobility and charge injection imbalance, always limit the device performance. Here we demonstrate that photoinduced space-charge layers, accumulated at organic semiconductor-insulator interfaces, can also play a role for photocurrent generation. Photocurrent transients from organic devices, with insulator-semiconductor interfaces, were systematically studied by using the double-layer model with an equivalent circuit. Results indicated that the electric fields in photoinduced space-charge layers can be utilized for charge generation and can even induce a photovoltage reversal. Such an operational process of light harvesting would be promising for photoelectric conversion in organic devices. View Full-Text
Keywords: organic semiconductor; organic photodiodes; organic optoelectronic devices; space-charge; insulator layer organic semiconductor; organic photodiodes; organic optoelectronic devices; space-charge; insulator layer
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MDPI and ACS Style

Hu, L.; Jin, W.; Feng, R.; Zaheer, M.; Nie, Q.; Chen, G.; Qiu, Z.-J.; Cong, C.; Liu, R. Photovoltage Reversal in Organic Optoelectronic Devices with Insulator-Semiconductor Interfaces. Materials 2018, 11, 1530.

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