Improving CdTe-Based Thin-Film Solar Cell Efficiency with the Oxygenated CdSe Layer Prepared by Sputtering Process

摘要

Sputtered CdSe window layer can improve the short-circuit current density (Jsc) ofCdTe-based thin-film solar cell, however, meanwhile degrade the open-circuitvoltage (V_(oc)) and fill factor (FF). Herein, an oxygenation process is introducedduring CdSe sputtering to improve this window layer’s property for better deviceperformance. The influence of oxygen on the CdSe is similar as the effect ofoxygen on CdS. Incorporation of oxygen into the CdSe film promotes the formationof CdSeO_3 phase. Both Voc and FF of the CdTe solar cells are improveddue to the formation of CdSeO_3, and high efficiency (Eff.) of 18.6% is achieved.Efficiency improvement at module level is also demonstrated after applying theCdSe:O process in production line. This progress contributes to the CdTe-basedthin-film module production for further efficiency improvement and costreduction.