Reconsideration of the gallium nitride: Dual functionality as an electron transporter and transparent conductor for recyclable polymer solar cell substrate applications
- Authors
- Lee, Kwang Jae; Yoon, Sang Eun; Jeon, Gyeong G.; Jung, Sung Hoon; Jung, Tae Hoon; Cho, Namchul; Yun, Jae Sung; Kim, Jincheol; Ho-Baillie, Anita W. Y.; Baek, Jong Hyeob; Song, Myungkwan; Kim, Jong H.
- Issue Date
- 15-Sep-2019
- Publisher
- Elsevier BV
- Keywords
- Gallium nitride; Charge transport layer; Transparent electrode; Doping; Recyclable substrate
- Citation
- Solar Energy Materials and Solar Cells, v.200
- Journal Title
- Solar Energy Materials and Solar Cells
- Volume
- 200
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/4207
- DOI
- 10.1016/j.solmat.2019.109971
- ISSN
- 0927-0248
1879-3398
- Abstract
- Herein, we report the dual functionality of a single n-type gallium nitride (n-GaN) layer as an electron transporter and transparent conductor, which has applications in reusable organic solar cells. After silicon doping with an optimized electron concentration, thin-film layer of GaN showed exceptional electrical properties including charge carrier mobility of 161 cm(2) V(-1)s(-1), electrical conductivity of 1.4x10(6) S cm(-1), and sheet resistance of 11.1 Omega cm(-2). Organic solar cells based on n-GaN exhibited power conversion efficiency comparable to those based on a conventional ITO/ZnO bilayered cathode. Furthermore, the n-GaN substrates exhibited reusability; due to excellent chemical stability of n-GaN, the reconstructed organic solar cells maintained their initial performance after the substrates were recycled. We suggest a new type of reusable n-GaN cathode layer featuring an integrated electron transporting layer and transparent electrode.
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