Due to their high resistance to real operational conditions, perovskite-based solar cells (PSCs) with dopant-free inorganic hole transport materials are good candidates for PSC commercialization. It should be noted that these types of PSCs have recorded lower power conversion efficiency (PCE) compared to Spiro-OMeTAD-based PSCs, with a recent PCE record of 25.8%. Here, we introduced nitrosonium tetrafluoroborate (NOBF₄) into the perovskite precursor to improve hole carriers' transport between the perovskite layer and copper phthalocyanine (CuPc) layer. Electrochemical impedance spectroscopy (EIS) showed that NOBF₄ additive reduces series resistance in PSC devices, which may be due to a band alignment between the valance band of perovskite and CuPc. In addition, due to a partial BF₄⁻ substitution with I⁻ ions during the fabrication process, the crystallinity properties of the perovskite layer are tailored, leading to the formation of a film with larger grains. By employing NOBF₄ material, in the obtained perovskite layer, a small unreacted lead iodide (PbI₂) amount remained. In total, the NOBF₄ additive brings a maximum efficiency of 16.77% for the target solar cell group, higher than the 14.42% for control devices. The target PSCs, compared with the control PSCs, showed improved air stability results from the suppressed PbI₂ with enlarged perovskite grains.

由于钙钛矿基太阳能电池 (PSC) 对实际操作条件具有很高的耐受性，因此具有无掺杂无机空穴传输材料的钙钛矿太阳能电池 (PSC) 是 PSC 商业化的良好候选者。应该指出的是，与基于 Spiro-OMeTAD 的 PSC 相比，这些类型的 PSC 的功率转换效率 (PCE) 较低，最近的 PCE 记录为 25.8%。在这里，我们将四氟硼酸亚硝鎓 (NOBF ₄ ) 引入钙钛矿前体中，以改善空穴载流子在钙钛矿层和铜酞菁 (CuPc) 层之间的传输。电化学阻抗谱 (EIS) 表明，NOBF ₄添加剂降低了 PSC 器件中的串联电阻，这可能是由于钙钛矿的价带与 CuPc 之间的能带对齐。此外，由于部分BF₄ ^-在制造过程中用 I ^-离子取代，钙钛矿层的结晶度特性被调整，导致形成具有更大晶粒的薄膜。通过使用NOBF ₄材料，在得到的钙钛矿层中，残留少量未反应的碘化铅(PbI ₂ )。总的来说，NOBF ₄添加剂为目标太阳能电池组带来了 16.77% 的最大效率，高于控制设备的 14.42%。与对照 PSC 相比，目标 PSC 的空气稳定性得到改善，这是由于 PbI ₂受到抑制，钙钛矿晶粒增大。