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Photoconversion Mechanism at the pn -Homojunction Interface in Single Organic Semiconductor by Lee, Ji-Hyun; Perrot, Armand; Hiramoto, Masahiro; Izawa, Seiichiro is a Engineering article available to read on EtoBox.

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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 th

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Author

Lee, Ji-Hyun; Perrot, Armand; Hiramoto, Masahiro; Izawa, Seiichiro

Publisher

MDPI AG; MDPI Open Access Publishing; Basel: MDPI, 2008-; Publons (ISSN 1996-1944)

Published

2020

Language

EN

Field

Engineering (Physical Sciences)