Title :
Determination of diffusion length with bi-facial spectral response [solar cells]
Author_Institution :
Inst. of Energy Conversion, Delaware Univ., Newark, DE, USA
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;
Conference_Titel :
Photovoltaic Specialists Conference, 1990., Conference Record of the Twenty First IEEE
Conference_Location :
Kissimmee, FL
DOI :
10.1109/PVSC.1990.111727
