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1. (WO2017150793) SOLAR CELL AND FABRICATION METHOD THEREFOR

Pub. No.:    WO/2017/150793    International Application No.:    PCT/KR2016/014789
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Sat Dec 17 00:59:59 CET 2016
IPC: H01L 31/0392
H01L 31/04
H01L 31/0445
H01L 31/18
Applicants: AVACO CO., LTD.
주식회사 아바코
Inventors: JANG, Seung Hyun
장승현
CHOI, Woo Jin
최우진
Title: SOLAR CELL AND FABRICATION METHOD THEREFOR
Abstract:
The present invention provides a solar cell capable of enhancing photoelectric conversion efficiency and a method for fabricating the same. The solar cell according to the present invention comprises: an electrode layer formed on a substrate; a light absorber layer formed on the electrode layer; a first buffer layer formed on the light absorber layer by an atomic layer deposition (ALD) process in which cadmium sulfide (CdS) and zinc sulfide (ZnS)are repeatedly deposited in an alternating manner; a second buffer layer formed on the first buffer layer by an atomic layer deposition process in which zinc oxide (ZnO) and zinc sulfide (ZnS) are repeatedly deposited in an alternating manner; and a window layer formed on the second buffer layer. As such, formation of the first buffer layer having cadmium sulfide (CdS) and zinc sulfide (ZnS) deposited repeatedly and alternatingly therein and the second buffer layer having zinc oxide (ZnO) and zinc sulfide (ZnS) deposited repeatedly and alternatingly therein between the light absorber layer and the window layer through an atomic layer deposition process reduces band offsets and lattice mismatches among the light absorber layer, the buffer layers, and the window layer, thus enhancing the photoelectric conversion efficiency of the solar cell.