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Observation of Charge Separation and Space‐Charge Region in Single‐Crystal P3HT/C 60 Heterojunction Nanowires
Author(s) -
Park Kyung Sun,
Lee Ki Seok,
Baek Jangmi,
Lee Lynn,
Son Byung Hee,
Koo Lee YongEun,
Ahn Yeong Hwan,
Park Won Il,
Kang Youngjong,
Sung Myung M.
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201603961
Subject(s) - heterojunction , nanowire , photocurrent , materials science , optoelectronics , space charge , charge carrier , depletion region , planar , nanoscopic scale , nanotechnology , charge (physics) , single crystal , crystallography , chemistry , semiconductor , physics , computer graphics (images) , quantum mechanics , computer science , electron
We directly observed charge separation and a space‐charge region in an organic single‐crystal p–n heterojunction nanowire, by means of scanning photocurrent microscopy. The axial p–n heterojunction nanowire had a well‐defined planar junction, consisted of P3HT (p‐type) and C 60 (n‐type) single crystals and was fabricated by means of the recently developed inkjet‐assisted nanotransfer printing technique. The depletion region formed at the p–n junction was directly observed by exploring the spatial distribution of photogenerated carriers along the heterojunction nanowire under various applied bias voltages. Our study provides a facile approach toward the precise characterization of charge transport in organic heterojunction systems as well as the design of efficient nanoscale organic optoelectronic devices.