The hole transport layer (HTL) plays a crucial role in the determining the charge extraction and transport performance of perovskite solar cells (PSCs). An additive engineering strategy is carried out by introducing different concentrations of ditetrabutylammonium dichromate (TBADC) into the spiro-OMeTAD precursor solution to essentially attain a pinholes-free HTL with smooth surface, resulting in significantly decreased the trap densities and suppressed the non-radiative recombination, thus enhanced the performance of the PSCs. As a result, the champion devices modified with 2.25 mM TBADC demonstrate an impressive power conversion efficiency (PCE) of 19.3% under 100 mW cm⁻² illuminations, which is higher than that of control devices without additive (17.6%). Overall, the introduction of TBADC additive in the HTL precursor provides a facile avenue to obtain high performance PSCs.

空穴传输层（HTL）在确定钙钛矿太阳能电池（PSC）的电荷提取和传输性能中起着至关重要的作用。通过将不同浓度的重铬酸四丁铵（TBADC）引入spiro-OMeTAD前体溶液中来执行添加工程策略，从而基本获得表面光滑的无针孔HTL，从而显着降低了陷阱密度并抑制了非辐射重组，从而提高了PSC的性能。结果，用2.25 mM TBADC修改的冠军设备在100 mW cm ^-2的功率转换效率（PCE）达到了19.3％比没有添加添加剂的控制设备（17.6％）高。总体而言，在HTL前体中引入TBADC添加剂提供了获得高性能PSC的便捷途径。