Hybrid organic-inorganic halide perovskites are low-cost solution-processable solar cell materials with photovoltaic properties that rival those of crystalline silicon. The perovskite films are typically sandwiched between thin layers of hole and electron transport materials, which efficiently extract photogenerated charges. This affords high-energy conversion efficiencies but results in significant performance and fabrication challenges. Herein we present a simple charge transport layer-free perovskite solar cell, comprising only a perovskite layer with two interdigitated gold back-contacts. Charge extraction is achieved via self-assembled monolayers and their associated dipole fields at the metal-perovskite interface. Photovoltages of ~600 mV generated by self-assembled molecular monolayer modified perovskite solar cells are equivalent to the built-in potential generated by individual dipole layers. Efficient charge extraction results in photocurrents of up to 12.1 mA cm−2 under simulated 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。钙钛矿薄膜通常夹在空穴和电子传输材料的薄层之间，可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。本文中，我们提出了一种简单的无电荷传输层的钙钛矿太阳能电池，仅包含具有两个相互交叉的金背接触的钙钛矿层。通过自组装单分子层及其在金属-钙钛矿界面处的相关偶极场实现电荷提取。自组装分子单层改性钙钛矿太阳能电池产生的〜600 mV的光电压等于各个偶极子层产生的内在电势。尽管电极间距很大，但在模拟的阳光下有效的电荷提取仍可产生高达12.1 mA cm -2 的光电流。
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