采用预蒸发硒化技术的柔性 Cu2ZnSn(S,Se)4 太阳能电池效率为 10.24%,Small

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采用预蒸发硒化技术的柔性 Cu2ZnSn(S,Se)4 太阳能电池效率为 10.24%
Small ( IF 13.0 ) Pub Date : 2022-05-05 , DOI: 10.1002/smll.202201347
Weihao Xie _{1,

2} , Quanzhen Sun _{1,

2} , Qiong Yan _{1,

2,

3} , Jionghua Wu _{1,

2} , Caixia Zhang _{1,

2} , Qiao Zheng _{1,

3,

4} , Yunfeng Lai _{1,

4} , Hui Deng _{1,

2} , Shuying Cheng _{1,

2,

4}

Affiliation

柔性Cu ₂ ZnSn(S,Se) ₄ (CZTSSe)太阳能电池由于无毒和低成本而显示出巨大的潜力。高温硒化过程中CZTSSe吸收体的质量是克服开路电压（V _{OC ）的关键}) 赤字和获得高效率。在这项工作中，作者开发了一种硒化技术，通过预蒸发硒化提高 CZTSSe 层的质量。该方法在硒化过程开始时提供饱和硒蒸气以促进结晶过程。过饱和的硒源大大缩短了高温退火时间。制备的 CZTSSe 薄膜具有较大的晶粒和较少的空隙。空间电荷限制电流的测量表明，CZTSSe吸收体的缺陷密度从4.43 × 10 ¹³ cm ^-3显着降低到3.46 × 10 ¹³ cm ^-3. 电气测试表明，这些器件在界面处具有更好的电荷分离，从而使电荷复合寿命从 133 µs 增加到 197 µs。柔性CZTSSe太阳能电池的功率转换效率在V _OC下达到10.24%，填充因子分别提高到463 mV和62%。安全无毒、高效的硒化方法有望为高效柔性CZTSSe太阳能电池提供新的策略。

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10.24% Efficiency of Flexible Cu2ZnSn(S,Se)4 Solar Cells by Pre-Evaporation Selenization Technique

Flexible Cu₂ZnSn(S,Se)₄ (CZTSSe) solar cells show great potential due to non-toxicity and low cost. The quality of CZTSSe absorber suffering from the high-temperature selenization process is the key to overcoming open-circuit voltage (V_OC) deficit and obtaining high efficiency. In this work, the authors develop a selenization technique to improve the quality of the CZTSSe layer by pre-evaporation selenization. This method provides saturated selenium vapor at the beginning of the selenization process to promote the crystallization process. The oversaturated selenium source greatly shortens the annealing time at high temperatures. The prepared CZTSSe films have larger grains and fewer voids. The measurement of the space charge limited current shows that the defect density of the CZTSSe absorber is significantly reduced from 4.43 × 10¹³ cm⁻³ to 3.46 × 10¹³ cm⁻³. Electrical tests show that the devices have better charge separation at the interface, resulting in a charge recombination lifetime, increasing from 133 to 197 µs. The power conversion efficiency of the flexible CZTSSe solar cell reaches 10.24% with V_OC and the fill factor enhances to 463 mV and 62%, respectively. The safe non-toxicity and efficient selenization method is expected to provide a new strategy for high-efficiency flexible CZTSSe solar cells.

更新日期：2022-05-05

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