Low-high heterojunction of c-Si substrate and μc-Si:H film under rear contact for improvement of efficiency

Author

Okamoto, S. ; Nishida, M. ; Yamasaki, I. ; Komatsu, Y. ; Kaneiwa, M. ; Nammori, T.

Author_Institution

Energy Conversion Labs., Sharp Corp., Nara, Japan

Volume

2

fYear

1994

fDate

5-9 Dec 1994

Firstpage

1295

Abstract

For improvement of conversion efficiencies of single-crystalline silicon (c-Si) solar cells, the low-high heterojunction structure of p-type c-Si substrate and a highly conductive B doped hydrogenated microcrystalline silicon (c-Si:H) film with a wide optical bandgap under a rear contact has been investigated. This paper reports that a conversion efficiency of 21.1% was obtained for a 5 cm×5 cm c-Si solar cell with the μc-Si:H film. This result has come from the examinations of the depositing conditions of the film and the improvement of rear reflection using a SiN film between the μc-Si:H film and the rear contact. From TEM observations, it was clear that the μc-Si:H film consisted of two kinds of domain classified by the crystallite degree of spatial order of Si atoms

Keywords

boron; electron microscopy; elemental semiconductors; hydrogen; p-n heterojunctions; semiconductor doping; semiconductor materials; semiconductor thin films; silicon; solar cells; transmission electron microscopy; μc-Si:H film; 21.1 percent; 5 cm; Si; Si-Si:H,B; SiN; TEM; c-Si substrate; conductive B doped c-Si:H film; conversion efficiency; deposition conditions; efficiency improvement; low-high heterojunction; rear contact; single-crystalline Si solar cells; wide optical bandgap; Conductive films; Crystallization; Heterojunctions; Optical films; Optical reflection; Photonic band gap; Photovoltaic cells; Semiconductor films; Silicon compounds; Substrates;

fLanguage

English

Publisher

ieee

Conference_Titel

Photovoltaic Energy Conversion, 1994., Conference Record of the Twenty Fourth. IEEE Photovoltaic Specialists Conference - 1994, 1994 IEEE First World Conference on

Conference_Location

Waikoloa, HI

Print_ISBN

0-7803-1460-3

Type

conf

DOI

10.1109/WCPEC.1994.519967

Filename

519967