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Hazarika, Abhijit; Zhao, Qian; Gaulding, E. Ashley; Christians, Jeffrey A; Dou, Benjia; Marshall, Ashley R; Moot, Taylor; Berry, Joseph J; Johnson, Justin C; Luther, Joseph M
ACS nano, 2018-Oct-23, Letnik: 12, Številka: 10Journal Article
We present a cation-exchange approach for tunable A-site alloys of cesium (Cs+) and formamidinium (FA+) lead triiodide perovskite nanocrystals that enables the formation of compositions spanning the complete range of Cs1–x FA x PbI3, unlike thin-film alloys or the direct synthesis of alloyed perovskite nanocrystals. These materials show bright and finely tunable emission in the red and near-infrared range between 650 and 800 nm. The activation energy for the miscibility between Cs+ and FA+ is measured (∼0.65 eV) and is shown to be higher than reported for X-site exchange in lead halide perovskites. We use these alloyed colloidal perovskite quantum dots to fabricate photovoltaic devices. In addition to the expanded compositional range for Cs1–x FA x PbI3 materials, the quantum dot solar cells exhibit high open-circuit voltage (V OC) with a lower loss than the thin-film perovskite devices of similar compositions.
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