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Effect of Grain Cluster Size on Back-Contact Perovskite Solar Cells

机译：晶粒簇大小对钙钛矿背接触式太阳能电池的影响

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摘要

Incorporating interdigitated back-contact electrodes into organic-inorganic halide perovskite solar cells overcomes the optical losses and low architectural defect tolerance present in conventional "sandwich" cell configurations. However, other factors limit device performance in back-contact architectures, such as the short charge-carrier diffusion length within the perovskite film relative to the electrode spacing. As charge-carrier diffusion length is crystal-size related, in order to understand the effect of perovskite morphology on the performance of back-contact perovskite solar cells (bc-PSCs), perovskite films with four different grain cluster sizes, i.e., large, medium, small, and extra small, are fabricated via a solvent annealing approach. Crystallization of the perovskite is found to be closely related to the surface chemistry and topography of the substrate. The bc-PSC photovoltaic performance correlates positively with the perovskite grain cluster size. Through a detailed analysis of transient photovoltage decay measurements, time-resolved photoluminescence, and space charge-limited current measurements, the effect of defect densities associated with grain cluster boundaries is elucidated.
机译：将叉指式背接触电极结合到有机-无机卤化物钙钛矿太阳能电池中可克服常规“夹心”电池配置中存在的光学损耗和低结构缺陷耐受性。但是，其他因素也限制了背接触架构中的器件性能，例如钙钛矿薄膜中相对于电极间距的短载流子扩散长度。由于电荷载流子扩散长度与晶体大小有关，因此为了了解钙钛矿形态对背接触钙钛矿太阳能电池（bc-PSCs）性能的影响，钙钛矿薄膜具有四种不同的晶粒簇尺寸，即大，中，小和超小是通过溶剂退火方法制造的。发现钙钛矿的结晶与基材的表面化学和形貌密切相关。 bc-PSC光伏性能与钙钛矿晶粒簇大小呈正相关。通过对瞬态光电压衰减测量，时间分辨的光致发光和空间电荷受限电流测量的详细分析，可以阐明与晶粒簇边界相关的缺陷密度的影响。

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