Highly Crystalline Methylammonium Lead Tribromide Perovskite Films for Efficient Photovoltaic Devices
2018; American Chemical Society; Volume: 3; Issue: 6 Linguagem: Inglês
10.1021/acsenergylett.8b00509
ISSN2380-8195
AutoresNakita K. Noel, Bernard Wenger, Severin N. Habisreutinger, Jay B. Patel, Timothy W. Crothers, Zhiping Wang, R. J. Nicholas, Michael B. Johnston, Laura M. Herz, Henry J. Snaith,
Tópico(s)Solid-state spectroscopy and crystallography
ResumoThe rise of metal-halide perovskite solar cells has captivated the research community, promising to disrupt the current energy landscape. While a sizable percentage of the research done on this class of materials has been focused on the neat and iodide-rich perovskites, bromide-based perovskites can deliver substantially higher voltages because of their relatively wide band gaps of over 2 eV. The potential for efficient, high-voltage devices makes materials such as these incredibly attractive for multijunction photovoltaic applications. Here, we use the acetonitrile/methylamine solvent system to deposit smooth, highly crystalline films of CH3NH3PbBr3. By using choline chloride as a passivating agent for these films, we achieve photoluminescence quantum efficiencies of up to 5.5% and demonstrate charge-carrier mobilities of 17.8 cm2/(V s). Incorporating these films into photovoltaic devices, we achieve scanned power conversion efficiencies of up to 8.9%, with stabilized efficiencies of 7.6%, providing a simple route to realizing efficient, high-voltage CH3NH3PbBr3 planar-heterojunction devices.
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