T. Hama

Research Field

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Citations (1)

Effect of p/i interface layer on dark J-V characteristics and Voc in p-i-n a-Si solar cells

Journal of Applied Physics (1990)

Hiroshi Sakai T. Yoshida S. Fujikake T. Hama Yukimi Ichikawa

Dark current-voltage (J-V) characteristics of p-i-n a-Si solar cells are studied to clarify the effect of the p/i interface layer on the open-circuit voltage (Voc). It is shown that the recombination current in the p/i interface region is predominant in the a-Si solar cells with an i-layer thickness of less than 200 nm and has a great effect on the dark-current transport in the solar cells. It is also shown that the current transport of the cells with the p/i interface layer of constant band gap of a thickness of more than 14 nm is effectively the same as that of a cell in which the band gap of the whole i layer is equal to that of the interface layer. A model in which the dark current of the cell consists of the recombination current at the p/i interface and the recombination current in the bulk region of the i layer is proposed. Using this model, the Voc degradation for the a-Si solar cells with the p/i interface layer is shown to be due to the defects generated in the i layer.

Open-circuit voltage

Degradation

10.1063/1.345340

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Citations (63)

Electronic behavior of calcined material obtained from a gallium-N-phenylene-N hybrid copolymer

Materials Research Bulletin (2007)

Hiroshi Matsui Shin‐ichi Yamamoto T. Hama S. Karuppuchamy Masakuni Yoshihara

Carbon fibers

10.1016/j.materresbull.2007.02.014

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Citations (2)

Orange electroluminescence from chemically synthesized zinc sulfide nanocrystals doped with manganese

Journal of Non-Crystalline Solids (2008)

Daisuke Adachi Tatsuki Morimoto T. Hama T. Toyama Hiroshi Okamoto

Zinc sulfide

Indium tin oxide

10.1016/j.jnoncrysol.2007.09.080

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Citations (12)

A new flexible a-Si PV module and its application to rooftop PV systems

Y. Ichikawa T. Ihara T. Hama Yoshikazu Watanuki S. Kato

A novel photovoltaic (PV) module for roof top systems, solar roofing, is proposed. Solar roofing is a flexible amorphous silicon (a-Si) PV sheet having the function of roofing. Tempered glass is used as a roof covering material. Technical items for roof top systems using solar roofing are discussed. Preliminary studies on module component materials show the feasibility of solar roofing. The authors design a construction technology for tempered glass covered roofs and the effects of shadows on PV modules upon its performance are also analyzed.

Photovoltaic mounting system

Solar cable

Building Integrated Photovoltaics

10.1109/wcpec.1994.520126

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Citations (4)

Electrical and structural properties of a-SiGe:H films

Journal of Non-Crystalline Solids (1985)

T. Ichimura T. Ihara T. Hama M. Ohsawa Hiroshi Sakai

Triode

Glow discharge

10.1016/0022-3093(85)90806-3