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Improving Performance of Organic-Silicon Heterojunction Solar Cells Based on Textured Surface via Acid Processing
Xiaowan Dai1, Tao Chen1, Hongkun Cai1
1Institute of Photo-electronic Thin Film Devices and Technology and ‡Department of Electronic Science and Engineering, College of Electronic Information and Optical Engineering, Nankai University , Tianjin, China , 300071.
Abstract:
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (
Pedot:
PSS) is widely applied in organic-photoelectronic devices due to its excellent transparency and conductivity. However, when it is used in the organic-silicon heterojunction solar cells with traditional pyramid texturing surface, the device performance is limited by the contact between the
Pedot:
PSS and silicon wafer at the bottom of the pyramids. We optimized the structure of the bottom of the pyramids via acid isotropic etching (AIE) method with mixed acid solution to ensure that the silicon wafer is fully covered by the
Pedot:
PSS. In addition, hydrogenated amorphous silicon thin films were deposited with PEVCD method as the passivation and back surface field (BSF) layer to decrease the rear surface recombination rate, thus increasing the long wavelength response. Finally, a power conversion efficiency of 13.78% was achieved after depositing MoO3 on the front of the device as the antireflection layer.
