Improved diphasic nc-si/a-si : H I-layer materials using PECVD

Two series of films has been prepared by using a new regime of plasma enhanced chemical vapor deposition (PECVD) in the region adjacent to the phase transition from amorphous to crystalline state. The photoelectronic properties of the films have been investigated as a function of crystalline fraction. In comparison with typical a-Si:H, these diphasic films with a crystalline fraction less than 0.3 show a similar optical absorption coefficient, higher mobility life-time product ( LT) and higher stability upon light soaking. By using the diphasic nc-Si/a-Si films as the intrinsic layer, a p-i-n junction solar cell has been prepared with an initial efficiency of 9. 10 % and a stabilized efficiency of 8.56 % (AM 1.5, 100 mW/cm(2)).

Two series of films has been prepared by using a new regime of plasma enhanced chemical vapor deposition (PECVD) in the region adjacent to the phase transition from amorphous to crystalline state. The photoelectronic properties of the films have been investigated as a function of crystalline fraction. In comparison with typical a-Si:H, these diphasic films with a crystalline fraction less than 0.3 show a similar optical absorption coefficient, higher mobility life-time product ( LT) and higher stability upon light soaking. By using the diphasic nc-Si/a-Si films as the intrinsic layer, a p-i-n junction solar cell has been prepared with an initial efficiency of 9. 10 % and a stabilized efficiency of 8.56 % (AM 1.5, 100 mW/cm(2)).

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Chinese Inst Elect.; IEEE Beijing Sect.; IEEE Elect Devices Soc.; IEEE EDS Beijing Chapter.; IEEE Solid-State Circuits Soc.; IEEE SSCS Beijing Chapter.; Japan Soc Appl Phys.; IEE Elect Div.; URSI Commiss D.; Inst Elect Engineers Korea.; Natl Nat Sci Fdn China.; Beijing Municipal Bureau Ind Dev.; Peking Univ.

Chinese Acad Sci, Inst Semicond, Ctr Condensed Matter Phys, State Lab Surface Phys, Beijing 100083, Peoples R China

Chinese Inst Elect.; IEEE Beijing Sect.; IEEE Elect Devices Soc.; IEEE EDS Beijing Chapter.; IEEE Solid-State Circuits Soc.; IEEE SSCS Beijing Chapter.; Japan Soc Appl Phys.; IEE Elect Div.; URSI Commiss D.; Inst Elect Engineers Korea.; Natl Nat Sci Fdn China.; Beijing Municipal Bureau Ind Dev.; Peking Univ.