论文标题
高效的Kesterite太阳能电池的精确调节相位演变策略
A precisely regulating phase evolution strategy for highly efficient kesterite solar cells
论文作者
论文摘要
硒过程中的相位演变对于高质量的Kesterite Cu2ZNSN（S，SE）4（CZTSSE）吸收剂和有效的太阳能电池至关重要。本文中，我们通过精确控制正腔室压力来调节Cu+-SN4+-MOE（MOE：2-甲氧基乙醇）系统的相位演变过程。我们发现，在加热阶段，在低温区域有意抑制Se蒸气浓度，这有效地降低了CZTS和SE原子之间的碰撞概率，因此明显抑制了表面和多步相位进化过程的二级相的形成。该策略使相位的演变能够以相对较高的温度开始，从而导致缺陷较少的高晶体质量CZTSSE吸收剂，相应的CZTSSE太阳能电池可以呈现14.1％的效率（总面积），这是迄今为止最高的结果。这项工作为CZTSSE吸收者的硒化机制提供了重要的见解，并探讨了一种新的动力学调节策略方式，以简化有效的CZTSSE太阳能电池的相位演化路径。
Phase evolution during the selenization is crucial for high-quality kesterite Cu2ZnSn(S, Se)4 (CZTSSe) absorbers and efficient solar cells. Herein, we regulate kinetic process of phase evolution from Cu+-Sn4+-MOE (MOE: 2-methoxyethanol) system by precisely controlling positive chamber pressure. We found that, at the heating-up stage, Se vapor concentration is intentionally suppressed in low-temperature region, which effectively reduces collision probability between the CZTS and Se atoms, thus remarkably inhibiting formation of secondary phases on the surface and multiple-step phase evolution processes. This strategy enables the phase evolution to start at relatively higher temperature and thereby leading to high crystalline quality CZTSSe absorber with fewer defects, and corresponding CZTSSe solar cell can present 14.1% efficiency (total area), which is the highest result so far. This work provides important insights into selenization mechanism of CZTSSe absorbers and explores a new way of kinetic regulation strategy to simplify the phase evolution path to efficient CZTSSe solar cells.
