Rapid thermal annealed WO3-doped In2O3 films for transparent electrodes in organic photovoltaics
- Authors
- Kim, Jun Ho; Shin, Yong-Hee; Seong, Tae-Yeon; Na, Seok-In; Kim, Han-Ki
- Issue Date
- 3-10월-2012
- Publisher
- IOP PUBLISHING LTD
- Citation
- JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.45, no.39
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF PHYSICS D-APPLIED PHYSICS
- Volume
- 45
- Number
- 39
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/107227
- DOI
- 10.1088/0022-3727/45/39/395104
- ISSN
- 0022-3727
- Abstract
- We investigated the effect of rapid thermal annealing (RTA) on the electrical, optical, structural and surface properties of WO3-doped In2O3 (IWO) films for use in organic solar cells (OSCs). Increasing the RTA temperature led to significant decreases in resistivity and sheet resistance due to activation of the W dopants and the (2 2 2) preferred orientation of the IWO films. At the optimized RTA temperature of 500 degrees C, the IWO film had a sheet resistance of 21 Omega/square and an optical transmittance of 89.39%, which is comparable to conventional ITO electrodes. Due to the high mobility of 46 cm(2) V-1 s(-1), the IWO film showed a higher optical transmittance in the near infrared wavelength region even though it had a low resistivity of 4.34 x 10(-4) Omega cm. Furthermore, the 500 degrees C annealed IWO film showed very smooth surface morphology due to its (2 2 2) preferred orientation. The performance (fill factor of 61.59%, short circuit current of 8.84 mA cm(-2), open circuit voltage of 0.60 V and power conversion efficiency of 3.27%) of the OSC fabricated with the IWO electrode was nearly identical to that of the OSC with a reference ITO anode, indicating that the IWO anode is a promising high-mobility transparent electrode material to replace conventional ITO anodes for high-performance OSCs.
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