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EFFECT OF OXYGEN ON PHOTOVOLTAIC PROPERTIES OF SCREEN-PRINTED CdS/CdTe SOLAR CELL AND MODULE Module Reliability and Oxygen Deficiency
Authors:SEIJI IKEGAMI  AKIHIKO NAKANO
Affiliation:1. Kinki University, Faculty of Science and Engineering , Kowakae, Higashi-Osaka, Osaka 577, Japan;2. Matsushita Battery Industrial Co., Ltd., Solar Battery Division , Matsushita-Cho, Moriguchi, Osaka 570, Japan
Abstract:An n-CdS/p-CdTe solar cell module constructed by complete seal of solar cell formed on a glass substrate by screen-printing and sintering process, was subjected to a heavy sunshine weather-meter test. The conversion efficiency of the module began to degrade after 50 days. Chemical analyses on gases in the sealed module showed that decrease in oxygen down to 2 vol.% had caused the degradation. Inversely, when sufficient oxygen was supplied to the solar cell by breaking the seal, the efficiency recovered up to its initial value within several days even at room temperature. Estimation of reaction velocity at room temperature suggested that the present recovery phenomenon was the same as increase in p-type characteristics by heat treatment in air in other fabrication process of CdS/CdTe junction. Easiness and reversibility of transformation from oxygen deficient to sufficient states in CdTe, strongly suggest that oxygen in CdTe induces a single acceptor which was confirmed in oxygen doped ZnSe.
Keywords:CdS  CdTe  II-VI compound  Hetero-junction  Solar cell  Reliability
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