The electron transport layer (ETL) is a critical component in perovskite quantum dot (PQD) solar cells, significantly impacting their photovoltaic performance and stability. Low-temperature ETL deposition methods are especially desirable for fabricating flexible solar cells on polymer substrates. Herein, we propose a room-temperature-processed tin oxide (SnO₂) ETL preparation method for flexible PQD solar cells. The process involves synthesizing highly crystalline SnO₂ nanocrystals stabilized with organic ligands, spin-coating their dispersion, followed by UV irradiation. The energy level of SnO₂ is controlled by doping gallium ions to reduce the energy level mismatch with the PQD. The proposed ETL-based CsPbI₃-PQD solar cell achieves a power conversion efficiency (PCE) of 12.70%, the highest PCE among reported flexible quantum dot solar cells, maintaining 94% of the initial PCE after 500 bending tests. Consequently, we demonstrate that a systemically designed ETL enhances the photovoltaic performance and mechanical stability of flexible optoelectronic devices.

电子传输层（ETL）是钙钛矿量子点（PQD）太阳能电池的关键组件，显着影响其光伏性能和稳定性。低温 ETL 沉积方法特别适用于在聚合物基板上制造柔性太阳能电池。在此，我们提出了一种用于柔性PQD太阳能电池的室温处理氧化锡（SnO ₂ ）ETL制备方法。该过程包括合成用有机配体稳定的高度结晶的 SnO ₂纳米晶体，旋涂其分散体，然后进行紫外线照射。通过掺杂镓离子来控制SnO ₂的能级，以减少与PQD的能级失配。所提出的基于ETL的CsPbI ₃ -PQD太阳能电池的功率转换效率（ PCE ）为12.70％，是已报道的柔性量子点太阳能电池中最高的PCE ，在500次弯曲测试后仍保持初始PCE的94％。因此，我们证明系统设计的 ETL 可以增强柔性光电器件的光伏性能和机械稳定性。