Abstract
Palladium diselenide as a thus‐far rarely studied group‐10 transition metal dichalcogenide, has exhibited great potential in the field of optoelectronics due to their superior conductivity, high carrier mobility, and excellent stability. However, few works are reported on the application of low‐dimensional PdSe2 in organic solar cells (OSCs). Herein, PdSe2 quantum dots (QDs) are introduced into the high‐efficient nonfullerene OSCs for the first time by incorporating the solution‐processable QDs in the hole transport layer (HTL) of the OSCs, leading to a dramatic efficiency enhancement of the devices. Upon PdSe2 QD addition, the maximum efficiency of the devices based on different active layer blends, including D18:Y6 and PM6:L8‐BO, is improved to 18.12%, and 18.29%, with efficiency enhancement of 8.96% and 6.90%, respectively, compared with that of the reference devices. The effects of PdSe2 QDs on the optical absorption, photoluminescence spectrum of the hybrid HTL as well as the carrier mobility, electrochemical impedance spectroscopy, and transient photocurrent/transient photovoltage of the devices are deeply investigated, revealing the efficiency enhancement of the OSCs with PdSe2 QDs addition results from the improved conductivity, light scattering, and hole transport properties of the hybrid HTL embedded with PdSe2 QDs.
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