通过锑掺杂提高柔性Cu2ZnSn(S,Se)4太阳能电池效率与机械稳定性的研究

Abstract Ensuring the photovoltaic efficiency of flexible solar cells while maintaining their mechanical durability presents a significant challenge for flexible CZTSSe solar cells. In this paper, an innovative Sb doping approach is introduced to regulate defects, mitigating the significant open-circuit voltage loss attributed to defects and enhancing the mechanical stability of flexible solar cells. The crystal quality of CZTSSe absorber undergoes a noticeable improvement, without altering the original kesterite structure at a SbCl 3 concentration of 0.8 mol/L. The porosity and residual stress undergo a substantial reduction from 8.19 % to 2.18 % and −10.11 GPa to −3.84 GPa, respectively. Consequently, the CZTSSe/CdS heterojunction prepared on this basis exhibits optimal band matching, characterized by a conduction band offset (CBO) of −0.23 eV. The final structured flexible device demonstrates remarkable mechanical stability, maintaining over 90 % of its original efficiency, even after enduring 500 cycles of concave and convex bending. This methodology offers a suite of theoretical insights for the development of flexible copper-based solar cells.