We deposited a smooth and uniform tin-perovskite layer on a hydrophobic conducting polymer, (bis (4-phenyl) (2,4,6-trimethylphenylamine) (PTAA), on modification of the PTAA surface with an organic ammonium salt, phenylethylammonium iodide (PEAI), according to a two-step approach. We found that π-π interaction between the phenyl rings of PTAA and PEAI plays an important role to modify the hydrophobicity of the PTAA surface and to passivate the crystal surface so as to form a tin-perovskite film of high quality. The FASnI₃ device with PTAA serving as a hole-transport layer (HTL) attained PCE 8.3 % with great stability, becoming the first example reported for a PTAA-based tin-perovskite solar cell. Our approach is applicable to other prospective HTL materials to match the energy levels between perovskite and HTL so as to enhance further the performance of the device.

我们在疏水导电聚合物（双（4-苯基）（2,4,6-三甲基苯胺）（PTAA）上沉积了光滑均匀的锡钙钛矿层，用有机铵盐苯乙基碘化铵改性PTAA表面(PEAI), 根据两步法. 我们发现 PTAA 和 PEAI 的苯环之间的 π-π 相互作用在改变 PTAA 表面的疏水性和钝化晶体表面从而形成高质量的锡钙钛矿薄膜。FASnI ₃以 PTAA 作为空穴传输层 (HTL) 的器件获得了 8.3% 的 PCE，并且具有很高的稳定性，成为第一个报道的基于 PTAA 的锡钙钛矿太阳能电池的例子。我们的方法适用于其他潜在的 HTL 材料，以匹配钙钛矿和 HTL 之间的能级，从而进一步提高器件的性能。