Yanran Li, Kang Li, Yisa Liu, Jiong Dong, Lili Xu, Ruixin Ma, Shina Li
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引用次数: 0
Abstract
Perovskite solar cells (PSCs) require hole transport materials (HTMs) with high carrier mobility, structural stability, and superior film quality. Cuprous oxide (Cu2O), an inorganic p-type semiconductor with a 2.17-eV direct bandgap and intrinsic vacancies, is a promising alternative to unstable organic HTMs. Herein, bidirectional pulsed (BP) electrodeposition is employed to overcome limitations of conventional direct current (DC) methods, which accumulate Cu²⁺ impurities, disordered grains, and high surface roughness due to unidirectional deposition. By introducing periodic dissolution phases and precisely regulating forward/reverse voltages (-0.4 V deposition; 0.03 V dissolution), a dynamic deposition-dissolution-redeposition equilibrium is achieved. This process selectively eliminates high-energy crystal facets/defects while promoting (100)-oriented growth, yielding films with significantly enhanced phase purity (77.38% Cu+ vs. 55.89% for DC) and atomically smooth surfaces (Ra < 5.00 nm). Optimized BP-Cu2O films exhibit superior optoelectronic properties: carrier mobility (46.14 vs. 42.12 cm2/V·s), carrier density (9.06 vs. 8.09 × 1021 cm-3), 10% lower resistivity (1.62 vs. 1.73 × 10-5 Ω/cm), and 92% visible-light transmittance. This work establishes BP electrodeposition as a single-step, post-processing-free strategy for high-performance Cu2O HTLs, providing a viable pathway toward efficient and stable PSCs.
期刊介绍:
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.