Hydrogenated Amorphous Silicon Emitter and Back-Surface-Field Contacts for Crystalline Silicon Solar Cells
Thin hydrogenated amorphous silicon (a-Si:H) layers deposited by hot-wire chemical vapor deposition (HWCVD) are investigated as emitters and back-surface-field (BSF) contacts to make silicon heterojunction solar cells on p-type crystalline silicon wafers. A common requirement for excellent emitter and BSF quality is minimization of interface recombination. Best results require immediate a Si:H deposition and an abrupt and flat interface to the c-Si substrate. We obtain record 16.9% and 14.8% efficiencies on p-type planar float-zone (FZ) and Czochralski (CZ) silicon substrates, respectively, with HWCVD a-Si:H(n) emitters and Al-BSF contacts. Initial efforts with p-type HWCVD Si thin films as the BSF have yielded 12.5% efficiency on p type CZ-Si.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC36-99-GO10337
- OSTI ID:
- 860682
- Report Number(s):
- NREL/CP-520-37033; TRN: US0504939
- Resource Relation:
- Related Information: Presented at the 2004 DOE Solar Energy Technologies Program Review Meeting, 25-28 October 2004, Denver, Colorado. Also included in the proceedings available on CD-ROM (DOE/GO-102005-2067; NREL/CD-520-37140)
- Country of Publication:
- United States
- Language:
- English
Similar Records
Progress in Silicon Heterojunction Devices by Hot-Wire CVD: Preprint
17.5% p-Type Silicon Heterojunction Solar Cells with HWCVD a-Si:H as the Emitter and Back Contact
Related Subjects
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
CHEMICAL VAPOR DEPOSITION
DEPOSITION
EFFICIENCY
HETEROJUNCTIONS
MINIMIZATION
RECOMBINATION
SILICON
SILICON SOLAR CELLS
SOLAR CELLS
SUBSTRATES
THIN FILMS
SOLAR ENERGY
PV
HYDROGENATE
AMORPHOUS SILICON (A-SI:H)
BACK-SURFACE-FIELD (BSF)
HOT-WIRE CHEMICAL VAPOR DEPOSITION (HWCVD)
HETEROJUNCTION SOLAR CELLS
P-TYPE
CRYSTALLINE SILICON WAFERS
Solar Energy - Photovoltaics
Silicon Materials and Devices