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Open AccessArticle

Photoconversion Mechanism at the pn-Homojunction Interface in Single Organic Semiconductor

1
Institute for Molecular Science, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan
2
SOKENDAI, The Graduate University for Advanced Studies, 5-1 Higashiyama, Myodaiji, Okazaki, Aichi 444-8787, Japan
3
École Nationale Supérieure de Chimie de Paris, 11 Rue Pierre et Marie Curie, 75005 Paris, France
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1727; https://doi.org/10.3390/ma13071727
Received: 18 March 2020 / Revised: 2 April 2020 / Accepted: 3 April 2020 / Published: 7 April 2020
(This article belongs to the Special Issue Organic Solar Cell and Optoelectronic Functional Materials)
Clarifying critical differences in free charge generation and recombination processes between inorganic and organic semiconductors is important for developing efficient organic photoconversion devices such as solar cells (SCs) and photodetector. In this study, we analyzed the dependence of doping concentration on the photoconversion process at the organic pn-homojunction interface in a single organic semiconductor using the temperature dependence of J–V characteristics and energy structure measurements. Even though the organic pn-homojunction SC devices were fabricated using a single host material and the doping technique resembling an inorganic pn-homojunction, the charge generation and recombination mechanisms are similar to that of conventional donor/acceptor (D/A) type organic SCs; that is, the charge separation happens from localized exciton and charge transfer (CT) state being separated by the energy offset between adjacent molecules, and the recombination happens from localized charge carrier at two adjacent molecules. The determining factor for photoconversion processes is the localized nature of charges in organic semiconductors. The results demonstrated that controlling the delocalization of the charges is important to realize efficient organic photoconversion devices. View Full-Text
Keywords: organic solar cell; pn junction; interface; doping; single organic semiconductor; photoconversion organic solar cell; pn junction; interface; doping; single organic semiconductor; photoconversion
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Lee, J.-H.; Perrot, A.; Hiramoto, M.; Izawa, S. Photoconversion Mechanism at the pn-Homojunction Interface in Single Organic Semiconductor. Materials 2020, 13, 1727.

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