Effect of oxide thin films in back contact on the optical absorption efficiency of thin crystalline Si solar cells

Title
Effect of oxide thin films in back contact on the optical absorption efficiency of thin crystalline Si solar cells
Authors
변석용변석주이택성신동우정증현김원목
Keywords
Thin crystalline Si solar cells; Back contact; Optical absorption efficiency; Oxide thin films; Ray tracing
Issue Date
2013-07
Publisher
Current applied physics
Citation
VOL 13, S140-S143
Abstract
The optical absorption efficiency (OAE) of thin crystalline Si (c-Si) solar cells was examined by using a direct absorption calculation algorithm based on the three-dimensional modeling and ray-tracing technique. The back contact was assumed to be made of ZnO based oxide layers with different optical constants and metallic electrode, and the front surface was assumed to be Lambertian. Simulation results showed that the insertion of non-absorptive oxide layer between c-Si and Al improved OAE, and that the relative amount of enhancement increased with decreasing refractive index, manifesting the reduction in absorption loss in Al electrode due to the increased total internal reflection. In the case of absorptive oxide layer, although increase in OAE was still attainable when compared with the back contact without oxide, the OAE was subdued significantly due to large absorption loss in oxide layer. The optimal oxide layer thickness was around 200 nm for non-absorptive oxide, and that of absorptive oxide decreased with increasing extinction coefficient. In the case of Ag metal contact, the enhancement of OAE due to the use of oxide layer was much less than the case of Al because of inherent high reflectivity and low absorption loss in Ag layer.
URI
http://pubs.kist.re.kr/handle/201004/45221
ISSN
15671739
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE