Transient photovoltage and dark current analysis on enhanced open-circuit voltage of polymer solar cells with hole blocking TiO2 nanoparticle interfacial layer
- Transient photovoltage and dark current analysis on enhanced open-circuit voltage of polymer solar cells with hole blocking TiO2 nanoparticle interfacial layer
- 김연수; 김태희; 김봉수; 이도권; 김홍곤; 주병권; 김경곤
- Polymer solar cells; Transient photovoltage; Vertical phase separation; Processing additive
- Issue Date
- Organic electronics
- VOL 14, NO 7, 1749-1754
- 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.
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