Non‐radiative recombination losses limit the property of perovskite solar cells (PSCs). Here, a synergistic strategy of SnSe2QDs doping into SnO2 and chlorhexidine acetate (CA) coating on the surface of perovskite is proposed. The introduction of 2D SnSe2QDs reduces the oxygen vacancy defects and increases the carrier mobility of SnO2. The optimized SnO2 as a buried interface obviously improves the crystallization quality of perovskite. The CA containing abundant active sites of ─NH2/─NH─, ─C═N, CO, ─Cl groups passivate the defects on the surface and grain boundary of perovskite. The alkyl chain of CA also improves the hydrophobicity of perovskite. Moreover, the synergism of SnSe2QDs and CA releases the residual stress and regulates the energy level arrangement at the top and bottom interface of perovskite. Benefiting from these advantages, the bulk and interface non‐radiative recombination loss is greatly suppressed and thereby increases the carrier transport and extraction in devices. As a result, the best power conversion efficiency (PCE) of 23.41% for rigid PSCs and the best PCE of 21.84% for flexible PSCs are reached. The rigid PSC maintains 89% of initial efficiency after storing nitrogen for 3100 h. The flexible PSCs retain 87% of the initial PCE after 5000 bending cycles at a bending radius of 5 mm.

中文翻译：

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SnSe2 量子点和醋酸氯己定协同抑制高效率和稳定性钙钛矿太阳能电池的非辐射复合损失

非辐射复合损失限制了钙钛矿太阳能电池（PSC）的性能。这里是 SnSe 的协同策略2量子点掺杂到 SnO 中2并提出在钙钛矿表面涂覆醋酸氯己定（CA）。二维硒化锡的介绍2量子点减少了氧空位缺陷并提高了 SnO 的载流子迁移率2。优化的 SnO2作为埋入界面，明显提高了钙钛矿的结晶质量。 CA含有丰富的─NH活性位点2/─NH─、─C=N、CO、─Cl基团钝化钙钛矿表面和晶界的缺陷。 CA的烷基链还提高了钙钛矿的疏水性。此外，SnSe 的协同作用2QDs和CA释放残余应力并调节钙钛矿上下界面的能级排列。受益于这些优点，体相和界面非辐射复合损失被大大抑制，从而增加了器件中的载流子传输和提取。结果，刚性PSC的最佳功率转换效率（PCE）为23.41％，柔性PSC的最佳PCE为21.84％。储存氮气 3100 小时后，刚性 PSC 仍保持 89% 的初始效率。在弯曲半径为 5 mm 的情况下进行 5000 次弯曲循环后，柔性 PSC 仍保留了 87% 的初始 PCE。