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Title: Wide-Gap Thin Film Si n-i-p Solar Cells Deposited by Hot-Wire CVD: Preprint

High-voltage wide bandgap thin-film Si n-i-p solar cells have been made using the hot-wire chemical vapor deposition (HWCVD) technique. The best open-circuit voltage (Voc) has exceeded 0.94 V in solar cells using HWCVD in the entire n-i-p structure. A Voc of 0.97V has been achieved using HWCVD in the n and i layers and plasma-enhanced (PE) CVD for the p layer. The high voltages are attributed to the wide-gap i layer and an improved p/i interface. The wide-gap i layer is obtained by using low substrate temperatures and sufficient hydrogen dilution during the growth of the i layer to arrive at the amorphous-to-microcrystalline phase transition region. The optical band gap (E04) of the i layer is found to be 1.90 eV. These high-voltage cells also exhibit good fill factors exceeding 0.7 with short-circuit-current densities of 8 to 10 mA/cm2 on bare stainless steel substrates. We have also carried out photoluminescence (PL) spectroscopy studies and found a correlation between Voc and the PL peak energy position.
Authors:
; ; ; ; ; ;
Publication Date:
OSTI Identifier:
15006977
Report Number(s):
NREL/CP-520-31474
TRN: US200412%%546
DOE Contract Number:
AC36-99-GO10337
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 May 2002; Related Information: Prepared for the 29th IEEE PV Specialists Conference, 20-24 May
Research Org:
National Renewable Energy Lab., Golden, CO (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 08 HYDROGEN; 14 SOLAR ENERGY; CHEMICAL VAPOR DEPOSITION; DILUTION; FILL FACTORS; HYDROGEN; ORGANIC COMPOUNDS; PHOTOLUMINESCENCE; SOLAR CELLS; SPECTROSCOPY; STAINLESS STEELS; SUBSTRATES; THIN FILMS; VOLATILE MATTER; SOLAR ENERGY PV; WIDE-GAP THIN FILM; HOT-WIRE CHEMICAL VAPOR DEPOSITION (HWCVD); OPEN CIRCUIT VOLTAGE; PLASMA-ENHANCED (PE); SHORT-CIRCUIT-CURRENT DENSITIES; PHOTOLUMINESCENCE (PL); SOLAR ENERGY - PHOTOVOLTAICS