Effects of substrate surface morphology on microcrystalline silicon solar cells

Citation
Y. Nasuno et al., Effects of substrate surface morphology on microcrystalline silicon solar cells, JPN J A P 2, 40(4A), 2001, pp. L303-L305
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Volume
40
Issue
4A
Year of publication
2001
Pages
L303 - L305
Database
ISI
SICI code
0021-4922(20010401)40:4A<L303:EOSSMO>2.0.ZU;2-9
Abstract
The relationship between muc-Si:H solar cell performance and surface morpho logy of substrate is studied systematically using textured-ZnO substrate wh ich is formed by wet etching process in order to clarify the optimum morpho logy of substrate for high efficiency. An average slope, tan theta, of subs trate surface textures is obtained by analysis of atomic force microscopy ( AFM) images, and solar cell performance is correlated with the value os tan theta. As a result, because of the balance between the optical confinement and the grain boundary formation, a conversion efficiency shows a maximum at a tan theta of 0.08 which is 3 times smaller as compared to that used fo r a-SM. An efficiency of 9.4% (V-oc = 0.526 V, J(se) = 25.3 mA/cm(2), FF = 0.710) is obtained at a deposition temperature of 140 degreesC using the op timized morphology.