期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 179, 期 -, 页码 95-101出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2018.02.011
关键词
Organic solar cells; Photodegradation; Blue photons; Transparent conducting electrode; Light scattering; Optical simulations
资金
- U.S. Department of Energy (DOE) Office of Science, Basic Energy Sciences, Materials Science and Engineering Division
- U.S. DOE [DE-AC02-07CH11358]
- National Science Foundation (NSF) [CBET-1336134]
- Office of Science of the U.S. DOE [DE-AC02-05CH11231]
We report the improvement in photostability of P3HT:PC60BM based bulk heterojunction solar cells deposited on Al-doped ZnO as a cathode layer replacing ITO as regularly used TCO in cells with N-I-P configuration. We experimentally and theoretically demonstrate that use of thicker ZnO:Al as cathode can successfully cut down the rate of photodegradation in short circuit current by similar to 40% and open circuit voltage by similar to 30% compared to the control device made on ITO based cathode. This effective reduction in photodegradation is understood to be coming from the absorption of ultraviolet and blue photon in the cathode layer itself. The loss in short circuit current due to the loss of blue photon in EQE is compensated by higher FF (lower series resistance) due to thicker ZnO:Al layer resulting in final device efficiency almost uncompromised with added benefit of reduced photo degradation. The experimental results are supported with optical simulations which show more absorption in the short wavelength region for the thicker ZnO films, compared to ITO films, deposited on glass substrates. This work also proposes using ZnO:Al cathode as a template for random textured front surface to potentially increase short circuit current by increase in photon absorption in active layer matrix by light scattering techniques. Our results provide an inexpensive pathway for improving the stability of organic photovoltaics without compromising the device performance.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据