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首页> 外文期刊>Advanced energy materials >Advanced Alkali Treatments for High-Efficiency Cu(In,Ga)Se2 Solar Cells on Flexible Substrates
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Advanced Alkali Treatments for High-Efficiency Cu(In,Ga)Se2 Solar Cells on Flexible Substrates

机译：柔性基板上高效Cu（In，Ga）Se2太阳能电池的高级碱处理

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摘要

Flexible, lightweight Cu(In,Ga)Se-2 (CIGS) solar cells grown on polymer substrates are a promising technology with fast growing market prospects. However, power conversion efficiencies of solar cells grown at low temperatures (approximate to 450 degrees C) remain below the efficiencies of cells grown at high temperature on glass substrates. This contribution discusses the impact on cell efficiency of process improvements of low-temperature CIGS deposition on flexible polyimide and glass substrates. Different strategies for incorporation of alkali elements into CIGS are evaluated based on a large number of depositions. Postdeposition treatment with heavy alkali (here RbF) enables a thickness reduction of the CdS buffer layer and increases the open-circuit voltage. Na supply during 3rd stage CIGS deposition positively impacts the cell performance. Coevaporation of heavy alkali (e.g., RbF) during capping layer deposition mitigates the adverse shunting associated with high Cu contents, yielding highest efficiencies with near-stoichiometric absorber compositions. Furthermore, optimization of the deposition sequence results in absorbers with a 1 mu m wide notch region with nearly constant bandgap minimum. The improved processes result in a record cell efficiency of 20.8% for CIGS on flexible substrate.
机译：在聚合物基板上生长的柔性轻质Cu（In，Ga）Se-2（CIGS）太阳能电池是一项有前途的技术，具有快速增长的市场前景。但是，在低温（约450摄氏度）下生长的太阳能电池的功率转换效率仍低于在玻璃基板上高温下生长的太阳能电池的效率。该贡献讨论了在柔性聚酰亚胺和玻璃基板上进行低温CIGS沉积工艺改进对电池效率的影响。基于大量沉积物，评估了将碱金属元素引入CIGS的不同策略。用重碱（此处为RbF）进行后沉积处理可减小CdS缓冲层的厚度并增加开路电压。在第三阶段CIGS沉积过程中的钠供应对电池性能产生积极影响。在覆盖层沉积过程中重碱（例如，RbF）的共蒸发减轻了与高Cu含量相关的不利分流，在化学计量接近的吸收剂组合物中产生了最高的效率。此外，沉积顺序的优化导致吸收器具有1微米宽的缺口区域，带隙最小值几乎恒定。改进的工艺导致柔性基板上CIGS的电池效率达到创纪录的20.8％。

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  • 来源
    《Advanced energy materials》 |2019年第24期|1900408.1-1900408.8|共8页
  • 作者

    Carron Romain; Nishiwaki Shiro; Feurer Thomas; Hertwig Ramis; Avancini Enrico; Lockinger Johannes; Yang Shih-Chi; Buecheler Stephan; Tiwari Ayodhya N.;

  • 作者单位

    Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Uberlandstr 129, CH-8600 Dubendorf, Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Uberlandstr 129, CH-8600 Dubendorf, Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Uberlandstr 129, CH-8600 Dubendorf, Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Uberlandstr 129, CH-8600 Dubendorf, Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Uberlandstr 129, CH-8600 Dubendorf, Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Uberlandstr 129, CH-8600 Dubendorf, Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Uberlandstr 129, CH-8600 Dubendorf, Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Uberlandstr 129, CH-8600 Dubendorf, Switzerland;

    Empa Swiss Fed Labs Mat Sci & Technol, Lab Thin Films & Photovolta, Uberlandstr 129, CH-8600 Dubendorf, Switzerland;

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  • 正文语种 eng
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  • 关键词

    alkali; CIGS; Cu(In; Ga)Se-2; flexible; PDT;

    机译：碱;CIGS;Cu（ja）se-2;柔性;pdt;

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