Boosting the efficiency of kesterite Cu2ZnSnS4 solar cells by optimizing the heterojunction interface quality

摘要

(CZTS) solar cells is one the critical factors for performance loss, especially when applying Zn-based alternative buffer replacing CdS. In this work, the CZTS/ZnCdS interface quality is optimized by applying ammonia as complexing agent in the precursor solution of the SILAR process for ZnCdS deposition. Excess oxide and hydroxide impurities formed at the interface are limited to a low level, which reduces the related electronic defects in the depletion region and alleviates the metastability behavior caused by the Zn(OH)