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Transient photovoltage and dark current analysis on enhanced open-circuit voltage of polymer solar cells with hole blocking TiO2 nanoparticle interfacial layer

Title
Transient photovoltage and dark current analysis on enhanced open-circuit voltage of polymer solar cells with hole blocking TiO2 nanoparticle interfacial layer
Authors
Kim Y.-S.Kim T.Kim B.Lee D.-K.Kim H.Ju B.-K.Kim K.
Ewha Authors
김경곤
SCOPUS Author ID
김경곤scopus
Issue Date
2013
Journal Title
Organic Electronics: physics, materials, applications
ISSN
1566-1199JCR Link
Citation
vol. 14, no. 7, pp. 1749 - 1754
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The open-circuit voltage of bulk heterojunction polymer solar cells utilizing 1,8-diiodooctane (DIO) as a processing additive was greatly improved by using an organic layer coated TiO2 nanoparticle interfacial layer inserted between the active layer and the Al electrode. The transient photovoltage measurement revealed that there was significant non-geminate recombination at the DIO-processed active layer/Al electrode interface. Reduced open-circuit voltage (VOC) of the photovoltaic devices and high water contact angle of the DIO-processed active layer showed that the DIO-processed active layer has an undesirable surface composition for the electron collection. The organic layer coated TiO2 nanoparticle interfacial layer effectively prevented the non-geminate recombination at the active layer/Al interface. As a result, we were able to significantly improve the VOC and power conversion efficiency from 0.46 V and 2.13% to 0.62 V and 3.95%, respectively. © 2013 Elsevier B.V. All rights reserved.
DOI
10.1016/j.orgel.2013.04.016
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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