Fabrication of Solar Cells Having SiH_2Cl_2 Based I-Layer Materials
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概要
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Intrinsic amorphous silicon films were fabricated using electron cyclotron resonance (ECR) assisted chemical vapor deposition and SiH_2Cl_2 source gas. Intrinsic layers were used for material characterization and also for the absorber layer of solar cells. The highly reducing atmosphere produced by the high energy ECR hydrogen plasma used to deposit these intrinsic films caused some degradation and/or etching of the previously deposited solar cell doped layers as well as the SnO_2-coated glass substrates. The p-layer etching rates were greater than those of the n-layer when these layers were exposed to ECR hydrogen plasma. Optimum photovoltaic performance was achieved when an optimized n/i interfacial buffer layer was used for a solar cell deposited in the n-i-p sequence. Better solar cell performances were obtained when the solar cells were measured under n-side illumination. In part, the buffer layer optimization involved careful consideration of band gap matching to the relatively wide band gap (1.85 eV) intrinsic layers prepared from SiH_2Cl_2. Further performance gains were possible through transparent conductive oxide/substrate optimization. For example, the open circuit voltage (V_<OC>) increased to 〜0.89 V when gallium-doped zinc oxide/glass substrates were used compared to 〜0.63 V when tin oxide/glass substrates were used. Interface recombination and minority carrier diffusion lengths were probed by n- and p-side illuminated quantum efficiency measurement and analysis. The electron and hole μτ products were estimated to be 4.4×10^<-8> cm^2/V and 3.5×10^<-8> cm^2/V, respectively. The stability of the solar cells was also examined.
- 社団法人応用物理学会の論文
- 1999-12-15
著者
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神谷 武志
東京大学大学院電子工学専攻
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神谷 武志
東大工
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Fortmann C
The Graduate School At Nagatsuta Tokyo Institute Of Technology
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Shimizu I
Osaka Univ. Osaka Jpn
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Katase Takayoshi
Aterials And Structures Laboratory Tokyo Institute Of Technology
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Shimizu I
The Graduate School At Nagatsuta Tokyo Institute Of Technology
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Shimizu Isamu
Imaging Science And Engineering Laboratory Tokyo Institute Of Technology
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Azuma Masanobu
Graduate School Tokyo Institute Of Technology
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神谷 利夫
Materials And Structures Laboratory Tokyo Institute Of Technology
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Shimizu Satoshi
Graduate School Tokyo Institute Of Technology
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KOMARU Takashi
Graduate School, Tokyo Institute of Technology
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OKAWA Kojiro
Graduate School, Tokyo Institute of Technology
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KAMIYA Toshio
Graduate School, Tokyo Institute of Technology
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FORTMANN Charles
Graduate School, Tokyo Institute of Technology
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SHIMIZU Isamu
Graduate School, Tokyo Institute of Technology
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Kamiya Toshio
Kochi Prefectural Industrial Technology Center
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Okawa K
Graduate School Tokyo Institute Of Technology
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神谷 武志
Department Of Gastroenterology And Metabolism Nagoya City University Graduate School Of Medical Scie
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