Thin film solar cells for indoor use

Abstract

The effect of low irradiance for thin film solar cells is investigated in this work. First, a-Si:H/CIGS/DSSC/OPV four kinds of thin film solar cells are fabricated and measured with the sun simulator (AM 1.5G, 100 mW/cm2). Then, the saturation current density J0 is extracted from the Voc and Jsc. Spectral irradiance of the desk light, LED light, sun light at the windowsill and fluorescent lamp are used to calculate the electrical parameters of the solar cells in indoor lighting conditions. From the calculation, a-Si solar cell under the LED light achieves the highest cell efficiency of 17.68%. In real measurement, it is also demonstrated that the cell efficiency of a-Si solar cell can reach 15.2% under the irradiance of 1.1 mW/cm2 LED light.