Improving Performance of Organic-Silicon Heterojunction Solar Cells Based on Textured Surface via Acid Processing

Xiaowan Dai; Tao Chen; Hongkun Cai; Hongbin Wen; Yun Sun

doi:10.1021/acsami.6b03164

Improving Performance of Organic-Silicon Heterojunction Solar Cells Based on Textured Surface via Acid Processing

ACS Appl Mater Interfaces. 2016 Jun 15;8(23):14572-7. doi: 10.1021/acsami.6b03164. Epub 2016 Jun 3.

Authors

Xiaowan Dai¹, Tao Chen¹, Hongkun Cai¹, Hongbin Wen¹, Yun Sun¹

Affiliation

¹ Institute 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.

PMID: 27232372
DOI: 10.1021/acsami.6b03164

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.

Keywords: MoO3; PECVD; PEDOT:PSS; acid isotropic etching(AIE); organic-silicon heterojunction solar cells.