Polyaniline (PANI) is a commonly used electrochromic material due to its tunable optical properties under an applied potential. In order to fabricate large-area electrochromic devices, PANI has to be deposited uniformly in large scale. Unfortunately, the existing deposition techniques can hardly meet the requirement. In this work, sequential solution polymerization (SSP) technique is introduced for in-situ deposition of large-area PANI films. This process involves synthesis of hydrated vanadium pentoxide (HVO), formation of V₂O₅ precursor film and in-situ polymerization in an aniline monomer solution. PANI films with a size of 16 × 10 cm² are realized using bar coating in ambient. This method is facile and efficient, compatible with roll-to-roll printing technology. Electrochromic devices based on SSP PANI films exhibit high optical contract in the vis-NIR region and good cyclability. This study demonstrates that SSP shows great potential in in-situ deposition of large-area PANI films for the development of optoelectronic modules.

聚苯胺 (PANI) 是一种常用的电致变色材料，因为它在外加电位下具有可调的光学特性。为了制造大面积电致变色器件，PANI 必须大规模均匀沉积。遗憾的是，现有的沉积技术难以满足要求。在这项工作中，顺序溶液聚合 (SSP) 技术被引入用于大面积 PANI 薄膜的原位沉积。该过程包括水合五氧化二钒 (HVO) 的合成、V ₂ O ₅前体膜的形成和苯胺单体溶液中的原位聚合。尺寸为 16 × 10 cm ^{2 的}PANI 薄膜在环境中使用棒涂实现。这种方法简便高效，兼容卷对卷印刷技术。基于 SSP PANI 薄膜的电致变色器件在可见近红外区域表现出高光学收缩和良好的循环性能。该研究表明，SSP 在用于开发光电模块的大面积 PANI 薄膜的原位沉积方面显示出巨大的潜力。