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首页> 外文期刊>Advanced energy materials >16.1% Efficient Hysteresis-Free Mesostructured Perovskite Solar Cells Based on Synergistically Improved ZnO Nanorod Arrays
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16.1% Efficient Hysteresis-Free Mesostructured Perovskite Solar Cells Based on Synergistically Improved ZnO Nanorod Arrays

机译：基于协同改进的ZnO纳米棒阵列的16.1％高效无磁致介观钙钛矿太阳能电池

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摘要

Significant efficiency improvements are reported in mesoscopic perovskite solar cells based on the development of a low-temperature solution-processed ZnO nanorod (NR) array exhibiting higher NR aspect ratio, enhanced electron density, and substantially reduced work function than conventional ZnO NRs. These features synergistically result in hysteresis-free, scan-independent, and stabilized devices with an efficiency of 16.1%. Electron-rich, nitrogen-doped ZnO (N:ZnO) NR-based electron transporting materials (ETMs) with enhanced electron mobility produced using ammonium acetate show consistently higher efficiencies by one to three power points than undoped ZnO NRs. Additionally, the preferential electrostatic interaction between the ­nonpolar facets of N:ZnO and the conjugated polyelectrolyte polyethylenimine (PEI) has been relied on to promote the hydrothermal growth of high aspect ratio NR arrays and substantially improve the infiltration of the perovskite light absorber into the ETM. Using the same interactions, a conformal PEI coating on the electron-rich high aspect ratio N:ZnO NR arrays is ­successfully applied, resulting in a favorable work function shift and altogether leading to the significant boost in efficiency from <10% up to >16%. These results largely surpass the state-of-the-art PCE of ZnO-based perovskite solar cells and highlight the benefits of synergistically combining mesoscale control with doping and surface modification.
机译：据报道，介观钙钛矿太阳能电池效率的显着提高是基于低温溶液处理的ZnO纳米棒（NR）阵列的开发，该阵列与常规ZnO NR相比具有更高的NR长宽比，增强的电子密度和显着降低的功函。这些功能协同产生了无磁滞，独立于扫描和稳定的器件，效率为16.1％。使用醋酸铵生产的具有增强的电子迁移率的富电子，掺杂氮的ZnO（N：ZnO）NR基电子传输材料（ETM）始终比未掺杂的ZnO NR效率高一到三个功率点。此外，N：ZnO的非极性刻面与共轭聚电解质聚乙烯亚胺（PEI）之间的优先静电相互作用已得到依赖，以促进高纵横比NR阵列的水热生长，并显着改善钙钛矿光吸收剂向ETM的渗透。使用相同的相互作用，成功地在富电子高纵横比N：ZnO NR阵列上应用了保形PEI涂层，从而产生了有利的功函数偏移，并导致效率显着提高，从<10％到> 16 ％。这些结果大大超过了基于ZnO的钙钛矿型太阳能电池的最新PCE，并突出了将中尺度控制与掺杂和表面改性协同结合的优势。

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