Organometallic halide perovskites have emerged in the last decade as promising light absorbers for solar cell development. These devices require functional layers for both generated hole and electron extraction and transport. Among the hole transporting materials (HTM), poly(3,4-ethylenedioxythiophene) poly-(styrenesulfonate) or PEDOT:PSS layers have been widely obtained from a colloidal suspension. As an alternative, PEDOT:PSS can also be electrochemically deposited, allowing for synthesis control and performance design. In this study, the effect of the electrodeposition method of PEDOT on its HTM properties and solar cell efficiency was evaluated. The result showed a decrease in the HTM charge carrier density with the increase in the polymerization potential. When this potential is around 1.5 V (vs Ag/AgCl), the Raman spectra suggest the formation of side groups in the polymer chains resulting from over-oxidation. HTMs with a high charge carrier density increased the short-circuit current density (Jsc) and fill factor (FF) but reduced the open-circuit potential (Voc) of the solar cells. To avoid overoxidation, low synthesis potentials were applied. With this strategy, a 15.0% power conversion efficiency (PCE) was achieved using the galvanostatic method at 0.1 mA cm⁻², where the applied potential was ∼1 V. Consequently, this work paves the way for the optimization of the solar cell by simply controlling the electrodeposition potential of the PEDOT as HTM.

有机金属卤化物钙钛矿在过去十年中出现，作为太阳能电池开发的有前途的光吸收剂。这些设备需要用于生成空穴和电子提取和传输的功能层。在空穴传输材料 (HTM) 中，聚（3,4-乙烯二氧噻吩）聚（苯乙烯磺酸盐）或 PEDOT：PSS 层已广泛从胶体悬浮液中获得。作为替代方案，PEDOT:PSS 也可以进行电化学沉积，从而实现合成控制和性能设计。在这项研究中，评估了 PEDOT 的电沉积方法对其 HTM 性能和太阳能电池效率的影响。结果表明，随着聚合电势的增加，HTM 载流子密度降低。当此电位约为 1.5 V（相对于 Ag/AgCl）时，拉曼光谱表明由于过度氧化而在聚合物链中形成了侧基。具有高载流子密度的 HTM 增加了短路电流密度 (Jsc) 和填充因子 (FF)，但降低了太阳能电池的开路电位 (Voc)。为避免过度氧化，应用了低合成电位。通过这种策略，在 0.1 mA cm 下使用恒电流法实现了 15.0% 的功率转换效率 (PCE)^-2，其中施加的电位为~1 V。因此，这项工作通过简单地控制 PEDOT 作为 HTM 的电沉积电位为优化太阳能电池铺平了道路。