Effect of hydrogen dilution in silane on light induced degradation of hydrogenated amorphous silicon films for solar photovoltaic applications

✍ Scribed by P.K. Acharya; H.D. Banerjee; K.L. Chopra; S.C. Saha; Swati Ray

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 362 KB
• Volume: 32
• Category: Article
• ISSN: 0927-0248
• DOI: 10.1016/0927-0248(94)90252-6

✦ Synopsis

Hydrogenated amorphous silicon films (a-Si:H) have been deposited by r.f. glow discharge of silane (Sill 4) and hydrogen (H 2) gas mixture. The hydrogen concentration in the gas mixture and the applied r.f. power density have been varied. The initial photoconductivity (crp), photosensitivity (%/~d), activation energy (Ea), optical band gap (Eg), hydrogen concentration, sub band gap absorption, Urbach energy (E 0) and defect density of the films have been measured, and the degradation, i.e., the reduction of photoconductivity under AM-I (100 mW/cm 2) white light, has been studied. Films prepared with 95% hydrogen dilution and 60 mW/cm 2 r.f power density show the lowest degradation.