Determination of diffusion length with bi-facial spectral response [solar cells]

Author

Phillips, James

Author_Institution

Inst. of Energy Conversion, Delaware Univ., Newark, DE, USA

fYear

1990

fDate

21-25 May 1990

Firstpage

782

Abstract

A method has been developed to determine the minority carrier diffusion length in operating CuInSe₂/(CdZn)S polycrystalline thin-film solar cells. The technique involves measuring the spectral responses through both the (CdZn)S front side of the device and the semitransparent molybdenum-glass back side. The simultaneous measurement of the quantum efficiency through both sides (bifacial) along with measurements of the optical transmission of the window layers and substrate allow the calculation of both the diffusion length and the absorption coefficient of the CuInSe₂. For a typical high-efficiency CuInSe₂ device, a diffusion length of 1.5 μm is obtained

Keywords

cadmium compounds; carrier mobility; copper compounds; indium compounds; minority carriers; solar cells; ternary semiconductors; zinc compounds; CuInSe₂-(CdZn)S; absorption coefficient; back side; bifacial; minority carrier diffusion length; optical transmission; polycrystalline; quantum efficiency; semiconductors; solar cells; spectral responses; substrate; window layers; Absorption; Charge measurement; Current measurement; Heterojunctions; Length measurement; Optical films; Photovoltaic cells; Radiative recombination; Space charge; Substrates;

fLanguage

English

Publisher

ieee

Conference_Titel

Photovoltaic Specialists Conference, 1990., Conference Record of the Twenty First IEEE

Conference_Location

Kissimmee, FL

Type

conf

DOI

10.1109/PVSC.1990.111727

Filename

111727