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首页> 外文会议>European Photovoltaic Solar Energy Conference and Exhibition >Enhancement of Carrier Collection in Cu_2ZnSn(SeS)_4 Solar Cell With Hybrid Buffer Layer
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Enhancement of Carrier Collection in Cu_2ZnSn(SeS)_4 Solar Cell With Hybrid Buffer Layer

机译：具有混合缓冲层的Cu_2ZnSn（SeS）_4太阳能电池载流子收集的增强

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Several groups have demonstrated high efficiency Cu_2ZnSnSe_4 (CZTSe), Cu_2ZnSnS_4 (CZTS) and Cu_2ZnSn(SeS)_4 (CZTSeS) solar cells. Especially the highest efficiency has been achieved via the solution-based CZTSeS cells by IBM. However, the power conversion efficiencies are still low as compared with the other solar cells because of the low open circuit voltage (V_(oc)). Recently, improvement of the V_(oc) in these solar cells by applying a hybrid buffer layer with combination of Cd-based and In-based buffer layers has been reported. The hybrid buffer is considered to drastically boost V_(oc) and previous reports have focused on V_(oc) and V_(oc) deficit (defined in E_g/q- V_(oc)). In this study we confirm that the hybrid buffer layer can boost not only V_(oc) but also J_(sc) in the CZTSeS solar cells made using a solution process. Specifically improvement of electrostatic potential fluctuation (γ_(opl)) and bandgap fluctuation (σ_g) which have a strong relation with the V_(oc) was confirmed, which indicates that the hybrid buffer has a potential to improve the band tailing problem in the CZTS-based solar cells. Furthermore, based on external quantum efficiency (EQE) and drive-level capacitance profiling (DLCP) analyses, improvement of EQE in the long wavelength region by enhancement of depletion width (X_d) was revealed. Finally the efficiency (Eff) of 12.7% in-house measurement in IBM (12.3% certificated in Newport) in solution-based CZTSeS cells has been achieved by applying the hybrid buffer layer.
机译：几个小组已经证明了高效的Cu_2ZnSnSe_4（CZTSe），Cu_2ZnSnS_4（CZTS）和Cu_2ZnSn（SeS）_4（CZTSeS）太阳能电池。尤其是IBM通过基于解决方案的CZTSeS单元实现了最高效率。然而，由于低的开路电压（V_（oc）），所以与其他太阳能电池相比，功率转换效率仍然较低。近来，已经报道了通过应用具有基于Cd和基于In的缓冲层的组合的混合缓冲层来改善这些太阳能电池中的V_（oc）。混合缓冲区被认为可以极大地提高V_（oc），以前的报道集中在V_（oc）和V_（oc）不足（定义为E_g / q-V_（oc））中。在这项研究中，我们证实了混合缓冲层不仅可以提高使用溶液法制备的CZTSeS太阳能电池中的V_（oc），而且可以提高J_（sc）。特别证实了与V_（oc）有很强关系的静电势波动（γ_（opl））和带隙波动（σ_g）的改善，这表明混合缓冲液有潜力改善CZTS中的带拖尾问题太阳能电池。此外，基于外部量子效率（EQE）和驱动级电容分析（DLCP）分析，揭示了通过增加耗尽宽度（X_d）改善长波长区域内EQE的方法。最后，通过应用混合缓冲层，在基于解决方案的CZTSeS单元中，IBM内部测量的效率（Eff）为12.7％（在纽波特获得了12.3％的认证）。

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