The enhancement of optical transmittance at the air/glass interface of amorphous silicon thin film solar cells was shown by application of a nanoporous polymethyl methacrylate (PMMA) antireflection (AR) coating. The PMMA coating was prepared by spin coating of PMMA solution in chloroform in the presence of a small amount of nonane. Because of the difference of the vapor pressure of chloroform and nonane, phase separated structure formed after complete evaporation of both of them during spin coating process. The Corning 1737 glass with the AR coating has high transmittance near 95% from 450-1100nm wavelengths. The amorphous silicon solar cells with the nanoporous PMMA AR coating realize an improvement in quantum efficiency (QE) up to 4% in 450-650nm spectral regions.
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Fang, L., Im, J.S., Park, S.I. et al. Improvement of Quantum Efficiency of Amorphous Silicon Thin Film Solar Cells by Using Nanoporous PMMA Antireflection Coating. MRS Online Proceedings Library 1153, 703 (2008). https://doi.org/10.1557/PROC-1153-A07-03