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Energy Level Tuning at the MAPbI 3 Perovskite/Contact Interface Using Chemical Treatment

2019; American Chemical Society; Volume: 4; Issue: 9 Linguagem: Inglês

10.1021/acsenergylett.9b01584

2380-8195

Daniele Meggiolaro, Edoardo Mosconi, Andrew H. Proppe, Rafael Quintero‐Bermudez, Shana O. Kelley, Edward H. Sargent, Filippo De Angelis,

Quantum Dots Synthesis And Properties

Metal halide perovskites are rivaling established materials for thin film photovoltaics. Being able to tune interfacial alignment of energy levels may allow a further boost to the efficiency of perovskite optoelectronic devices. By using Density Functional Theory (DFT) modeling and experimental analysis, we show that the band edge energies of the prototypical MAPbI3 (MA = methylammonium) perovskite can in principle be varied by as much as 1 eV via postsynthetic chemical treatment. In particular, MAI-rich (PbI2-rich) surfaces induce an energy upshift (downshift) of the perovskite band energies, and this can either inhibit or favor hole transfer at the perovskite/HTL interface.