Photovoltage Reversal in Organic Optoelectronic Devices with Insulator-Semiconductor Interfaces

Materials
Laigui HuRan Liu

Abstract

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.

References

May 21, 2005·Physical Review Letters·V D MihailetchiP W M Blom
Jun 17, 2008·Nature Materials·Kamal AsadiPaul W M Blom
Oct 27, 2010·Advanced Materials·Malte C GatherKlaus Meerholz
Feb 15, 2011·Nature Materials·Yongbo YuanJinsong Huang
Oct 27, 2011·Physical Review Letters·Jan SeidelJoel W Ager
Oct 10, 2013·Advanced Materials·Letian DouYang Yang
Apr 26, 2014·Advanced Materials·Vini GautamK S Narayan
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May 3, 2016·Advanced Materials·Charles PaillardBrahim Dkhil
Nov 25, 2017·ACS Applied Materials & Interfaces·Qiang ZhaoWenping Hu

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Methods Mentioned

BETA
scanning electron microscopy
quartz-crystal microbalance

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