Abstract
To reduce the surface defects of perovskite film and hole extraction loss, an organic small molecule, 1,3‐dihydroxypropan‐2‐one (DHA), is introduced at the perovskite/hole transport layer interface. Fourier transform infrared spectroscopy is conducted to reveal the interactions (coordination and hydrogen bonding) between DHA and perovskite. A variety of characterizations (including photoluminescence (PL), time‐resolved photoluminescence (TRPL), electrochemical impedance spectroscopy (EIS), etc.) are performed to disclose the effect of DHA on device performance. Consequently, a high efficiency of 23.26% is obtained for the DHA‐treated device, while the control device shows only a companion efficiency of 20.21%. Moreover, the DHA‐treated devices exhibit improved storage and thermal stability.
Published Version
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