Hisato Shinohara

Fabrication and properties of the flexible a-Si:H solar cells on plastic films using roll-to-roll method

Flexible a-Si:H solar cells were fabricated on plastic films using the roll-to-roll method. The films used in this study were 0.075 mm thick and 230 mm wide. These solar cells were fabricated in a sequential process. We studied the distribution of characteristics in the longitudinal direction of the film. A conversion efficiency of 8.02% was obtained under AM-1.5 100 mW/cm/sup 2/. Stability of the submodule was estimated, and we developed a new organic resin material. The submodule achieved high reliability at high temperature and humidity.

Fabrication and properties of flexible a-Si:H solar cells with textured AlSi alloy electrodes

Abstract A back-reflective textured electrode was made by sputtering both pure Al and AlSi alloy materials. The electrode surface morphology and the light trapping effects related to the a-Si:H based solar cell were studied. The optical properties of the back reflective textured electrodes were examined from diffuse reflectance. The diffuse reflectance could be changed within the range 5% to 70% when the AlSi alloy material was used. The surface morphology of the textured electrodes was also changed by the use of AlSi alloy. The characteristics of the solar cell were investigated in respect of the relation between surface morphology of the textured electrode and the enhancement effect of the collection efficiency. Fine surface morphology was obtained when the AlSi alloy material was used and the short circuit current of the solar cell was increased effectively by the use of the textured electrode.