Perovskite‐based tandem solar cells have demonstrated high potential for overcoming the Shockley–Queisser limit. Routine bandgap (RBG, ≈1.55 eV) perovskites have achieved a perfect balance between efficiency and stability. The narrow bandgap (NBG) candidates for RBG perovskite‐based tandem devices are very limited. Lead sulfide (PbS) colloidal quantum dots (CQDs) are a promising partner due to their broad absorption spectra. However, the efficiency of RBG perovskite/QD tandem devices still lags behind. Herein, efficient RBG perovskite/QDs four‐terminal tandem photovoltaics are successfully implemented through synergistic enhancement from transparent electrode and band alignment Engineering. For tin doped indium oxide (ITO) electrodes, their conductivity and near‐infrared transparency are leveraged using magnetron sputtering and reactive plasma deposition (RPD) methods. Furthermore, instead of traditional zinc oxide, aluminum‐doped zinc oxide (AZO) is developed to enhance the carrier extraction capability of PbS QD bottom cells. Based on the above enhancements, ≈0.95 eV PbS solar cells achieve a record efficiency of 14.14%. Integrated with the front semi‐transparent perovskite solar cells, the four‐terminal perovskite/QD tandem device reaches a record efficiency of 26.12%. The synergistic combination of the RBG perovskite and NBG QD devices provides promising prospects for tandem photovoltaics.

中文翻译：

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基于透明电极和能带对准工程的高效钙钛矿/量子点串联太阳能电池的协同增强

基于钙钛矿的串联太阳能电池已被证明具有克服肖克利-奎瑟极限的巨大潜力。常规带隙（RBG，约1.55 eV）钙钛矿已经实现了效率和稳定性之间的完美平衡。基于 RBG 钙钛矿的串联器件的窄带隙 (NBG) 候选者非常有限。硫化铅 (PbS) 胶体量子点 (CQD) 因其宽吸收光谱而成为有前景的合作伙伴。然而，RBG钙钛矿/QD串联器件的效率仍然落后。在此，通过透明电极和能带对准工程的协同增强，成功实现了高效的RBG钙钛矿/量子点四端串联光伏发电。对于锡掺杂氧化铟 (ITO) 电极，使用磁控溅射和反应等离子体沉积 (RPD) 方法可充分利用其导电性和近红外透明度。此外，我们开发了铝掺杂氧化锌（AZO）来代替传统的氧化锌，以增强 PbS QD 底部电池的载流子提取能力。基于上述增强，约 0.95 eV PbS 太阳能电池的效率达到创纪录的 14.14%。与前置半透明钙钛矿太阳能电池集成，四端钙钛矿/QD串联器件达到了创纪录的26.12%的效率。 RBG钙钛矿和NBG量子点器件的协同组合为串联光伏发电提供了广阔的前景。