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
김연수김태희김봉수이도권김홍곤주병권김경곤
Keywords
Polymer solar cells; Transient photovoltage; Vertical phase separation; Processing additive
Issue Date
2013-07
Publisher
Organic electronics
Citation
VOL 14, NO 7, 1749-1754
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.
URI
http://pubs.kist.re.kr/handle/201004/45130
ISSN
15661199
Appears in Collections:
KIST Publication > Article
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