Highly efficient flexible organic photovoltaics using quasi-amorphous ZnO/Ag/ZnO transparent electrodes for indoor applications
- Authors
- Lee, Byeong Ryong; Goo, Ji Soo; Kim, Yong Woon; You, Young-Jun; Kim, Hhyeok; Lee, Sang-Kwon; Shim, Jae Won; Kim, Tae Geun
- Issue Date
- Mar-2019
- Publisher
- Elsevier B.V.
- Keywords
- Organic photovoltaic devices; Indoor light conditions; ZnO/Ag/ZnO transparent conducting electrode; Micro-cavity effect; Flexible
- Citation
- Journal of Power Sources, v.417, pp 61 - 69
- Pages
- 9
- Journal Title
- Journal of Power Sources
- Volume
- 417
- Start Page
- 61
- End Page
- 69
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/18523
- DOI
- 10.1016/j.jpowsour.2019.02.015
- ISSN
- 0378-7753
1873-2755
- Abstract
- We report the indoor performance of flexible organic photovoltaic devices utilizing quasi-amorphous ZnO/Ag/ZnO as the transparent conducting electrode. A ZnO/Ag/ZnO electrode with specific thickness values of 40/9/50 nm provides excellent transparent conducting electrode properties with transmittances up to 92% in the visible region, a sheet resistance of 4.8 Ω/sq, and a root-mean squared surface roughness value of 2.1 nm. In addition, the micro-cavity effect and quasi-amorphous structural properties of the ZnO/Ag/ZnO electrode allow further enhanced light absorption and mechanical stability, respectively. Poly (3-hexylthiophene):indene-C 60 bisadduct photoactive layer-based inverted organic photovoltaics with the ZnO/Ag/ZnO (40/9/50 nm) electrode yield an averaged power-conversion efficiency of 12.3% under a light-emitting diode lamp with a luminance of 500 lux, which is 20% greater than the power-conversion efficiency value of the reference organic photovoltaics with an indium tin oxide electrode. Furthermore, the same organic photovoltaics on flexible polyethylene terephthalate substrates exhibit excellent mechanical stability (i.e., 92% of the initial power-conversion efficiency value is maintained even after 400 bending cycles with a bending radius of 9.55 mm), with averaged power-conversion efficiency values of 10.2% under the 500-lux light-emitting diode. © 2019 Elsevier B.V.
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