CsPbI₂Br-based perovskite solar cells (PSCs) have attracted much attention because of their excellent phase stability and appropriate bandgap. However, numerous defects of undercoordinated ions or mobile species are the sites of carrier nonradiative recombination, causing a low power conversion efficiency (PCE). In this work, NaCl and nitrogen-doped graphene quantum dots (N-GQDs) as binary additives are introduced into perovskite precursor to obtain high-quality photoactive films. Chloride ion (Cl⁻) is incorporated into perovskite due to the same physical and chemical properties as bromine (Br⁻), that align the energy level of CsPbI₂Br, decrease the energy barrier between perovskite and P3HT to promote carrier transport and extraction, hence result in the reduced energy loss. Meanwhile, because of its good conductivity, N-GQDs at grain boundaries can rapidly conduct photogenerated electrons to SnO₂, suppressing carrier recombination at grain boundaries. Furthermore, the trap state density of the CsPbI₂Br film with binary additives is reduced, which could prolong the carrier lifetime, and improve surface morphology. As a result, a PCE of 15.37% for CsPbI₂Br PSCs with binary additives is obtained，which shows ∼22.76% relative increment compare with the pristine PSCs. Therefore, a simple and convenient optimization strategy of binary additives for PSCs is proposed in this work.

基于CsPbI ₂ Br 的钙钛矿太阳能电池 (PSC) 因其出色的相稳定性和适当的带隙而备受关注。然而，许多配位不足的离子或移动物种的缺陷是载流子非辐射复合的场所，导致低功率转换效率（PCE）。在这项工作中，将 NaCl 和氮掺杂石墨烯量子点 (N-GQDs) 作为二元添加剂引入钙钛矿前驱体中，以获得高质量的光活性薄膜。^{由于与溴 (Br -} ) 相同的物理和化学性质，氯离子 (Cl ^- ) 被并入钙钛矿中，这与 CsPbI ₂的能级一致Br，降低钙钛矿和 P3HT 之间的能垒以促进载流子传输和提取，从而减少能量损失。同时，由于其良好的导电性，晶界处的N-GQDs可以快速将光生电子传导至SnO ₂，​​抑制晶界处的载流子复合。此外，二元添加剂降低了CsPbI ₂ Br薄膜的陷阱态密度，从而延长了载流子寿命，改善了表面形貌。因此，具有二元添加剂的 CsPbI ₂ Br PSC 的 PCE 为 15.37%，与原始 PSC 相比显示了 ~22.76% 的相对增量。因此，本工作提出了一种简单方便的 PSC 二元添加剂优化策略。