期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 115, 期 -, 页码 36-41出版社
ELSEVIER
DOI: 10.1016/j.solmat.2013.03.014
关键词
Organic photovoltaics; Light trapping; Absorption enhancement; Textured film; V-groove texturing
资金
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) [2012-0003991]
- Center for Inorganic Photovoltaic Materials [2012-0001172]
- MEST
- EEWS Research Project of the office of the KAIST EEWS Initiative, KAIST Institute for the Nano Century [EEWS-2013-N01130018]
- Samsung Display Co.
- Korea Foundation for Advanced Studies (KFAS)
- NRF
We propose textured plastic films attached to the external surface of the substrates of organic photovoltaic devices (OPVs) as spectrally neutral light trapping schemes. Both randomly textured films and those containing an array of V-grooves are explored from experimental and theoretical perspectives. Randomly textured surface, providing a close approximation to the Lambertian scatterer that increases the total optical path length of the incident light, is shown to yield an enhancement in short-circuit current density (J(sc)) as large as 9.3% in polymer:fullerene bulk heterojunction cells. Different from the case of random texturing, V-groove texturing scheme manages the light in a controlled manner yet can still enhance the optical path length upon careful optimization. In particular, a V-groove with the vertex angle of 100.8-112.0 degrees is found to be highly effective as it suppresses the internal rays from escaping the structure. Together with use of highly reflecting Ag electrodes, V-grooves with the optimal vertex angle leads to 15% enhancement in J(sc), improving the efficiency of OPV cells under study from 6.5% to 7.4%. (C) 2013 Elsevier B.V. All rights reserved.
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