Hybrid organic-inorganic halide perovskites are low-cost solution-processablesolar cell materials with photovoltaic properties that rival those ofcrystalline silicon. The perovskite films are typically sandwiched between thinlayers of hole and electron transport materials, which efficiently extractphotogenerated charges. This affords high-energy conversion efficiencies butresults in significant performance and fabrication challenges. Herein wepresent a simple charge transport layer-free perovskite solar cell (PSC),comprising only a perovskite layer with two interdigitated gold back-contacts.Charge extraction is achieved via self-assembled molecular monolayers (SAMs)and their associated dipole fields at the metal/perovskite interface.Photovoltages of approximately 600 mV generated by SAM-modified PSCs areequivalent to the built-in potential generated by individual dipole layers.Efficient charge extraction results in photocurrents of up to 12.1 mA/cm2 undersimulated sunlight, despite a large electrode spacing.
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机译：杂化有机-无机卤化物钙钛矿是低成本的可溶液加工的太阳能电池材料，其光伏性能可与晶体硅媲美。钙钛矿膜通常夹在空穴和电子传输材料的薄层之间，从而有效地提取光生电荷。这提供了高能量转换效率，但导致了显着的性能和制造挑战。本文介绍了一种简单的无电荷传输层的钙钛矿太阳能电池（PSC），仅包含具有两个相互交叉的金背接触的钙钛矿层。通过自组装分子单分子层（SAMs）及其与金属相关的偶极子场实现电荷提取/钙钛矿界面.SAM修饰的PSC产生的约600 mV的光电压等于各个偶极子层产生的内在电势。尽管电极间距较大，但有效的电荷提取仍导致在模拟太阳光下的光电流高达12.1 mA / cm2。
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