The unstable PbSe quantum dot (QD) surface requires tedious and complicated synthetic protocols and renders them substantially underdeveloped compared to PbS QDs. Here, we describe a direct synthesis of PbSe QD inks at room temperature. In comparison to the conventional three-step synthesis, our strategy simplifies the fabrication process to one step and reduces the preparation cost by a factor of eight. A photovoltaic device based on these PbSe QD inks has achieved a photovoltaic conversion efficiency (PCE) of 10.38% with high device stability, which is one of the highest PCEs for all reported PbSe QD solar cells. More importantly, the obtained ink has demonstrated the best colloidal stability by far compared with all the reported lead chalcogenides (PbX) QD inks for photovoltaic application. This simple and low-cost synthesis will facilitate ink storage and transport and may ignite a new round of research efforts on the optoelectronic applications of PbSe QDs.

中文翻译：

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基于直接合成半导体油墨的PbSe量子点太阳能电池

与PbS QD相比，不稳定的PbSe量子点（QD）表面需要乏味而复杂的合成协议，并使它们显着欠发达。在这里，我们描述了在室温下直接合成PbSe QD油墨。与传统的三步合成法相比，我们的策略将制造过程简化为一个步骤，并将制备成本降低了八倍。基于这些PbSe QD油墨的光伏器件实现了10.38％的光电转换效率（PCE），具有很高的器件稳定性，这是所有报告的PbSe QD太阳能电池中最高的PCE之一。更重要的是，与所有已报道的用于光伏应用的硫族铅（PbX）QD油墨相比，所获得的油墨已显示出最佳的胶体稳定性。