2D perovskite stabilized phase-pure formamidinium perovskite solar cells.
2D perovskite stabilized phase-pure formamidinium perovskite solar cells.
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2D钙钛矿稳定的相光甲米氨基丁基太阳能电池。
DOI：
10.1038/s41467-018-05454-4
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发表时间：
2018-08-01
影响因子：
16.6
通讯作者：
Yang Y
中科院分区：
文献类型：
--
作者：
Lee JW;Dai Z;Han TH;Choi C;Chang SY;Lee SJ;De Marco N;Zhao H;Sun P;Huang Y;Yang Y
成分工程已被用来克服困难，在制造高品质的相纯的甲脒钙钛矿薄膜连同其环境不稳定性。然而，这伴随着牺牲器件光电流的带隙的不期望的增加。在这里，我们报告的相位纯甲脒-三碘化铅钙钛矿薄膜具有优异的光电质量和稳定性的制造。将1.67摩尔%的2D苯基乙基铵碘化铅掺入前体溶液中能够形成具有数量级增强的光致发光寿命的相纯甲脒钙钛矿。2D钙钛矿在晶界处自发地形成，以保护甲脒钙钛矿免受水分的影响并抑制离子迁移。在短路电流密度超过24 mA cm−2、开路电压为1.130 V（相当于电位损失为0.35 V）的情况下，实现了20.64%的稳定功率转换效率（PCE）（认证稳定PCE为19.77%），大幅提高了工作稳定性。利用混合阳离子卤化物可以提高甲脒钙钛矿膜和器件的稳定性，但由于带隙的增加而牺牲光电流。在这里，Lee等人引入了少量的2D钙钛矿，以获得基于纯相甲脒基钙钛矿的高效率和稳定性。
Compositional engineering has been used to overcome difficulties in fabricating high-quality phase-pure formamidinium perovskite films together with its ambient instability. However, this comes alongside an undesirable increase in bandgap that sacrifices the device photocurrent. Here we report the fabrication of phase-pure formamidinium-lead tri-iodide perovskite films with excellent optoelectronic quality and stability. Incorporation of 1.67 mol% of 2D phenylethylammonium lead iodide into the precursor solution enables the formation of phase-pure formamidinium perovskite with an order of magnitude enhanced photoluminescence lifetime. The 2D perovskite spontaneously forms at grain boundaries to protect the formamidinium perovskite from moisture and suppress ion migration. A stabilized power conversion efficiency (PCE) of 20.64% (certified stabilized PCE of 19.77%) is achieved with a short-circuit current density exceeding 24 mA cm−2 and an open-circuit voltage of 1.130 V, corresponding to a loss-in-potential of 0.35 V, and significantly enhanced operational stability. Utilizing mixed-cation-halide can improve stability of the formamidinium perovskite films and devices but sacrifices the photocurrent due to an increase in bandgap. Here Lee et al. introduced small amounts of 2D perovskite to obtain high efficiency and stability based on phase-pure formamidinium based perovskite.
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影响因子：
56.9
作者：
Lee, Michael M.;Teuscher, Joel;Snaith, Henry J.
通讯作者：
Snaith, Henry J.
影响因子：
15
作者：
Lee, Jin-Wook;Dai, Zhenghong;Yang, Yang
通讯作者：
Yang, Yang
影响因子：
29.4
作者：
Lee, Jin-Wook;Seol, Dong-Jin;Park, Nam-Gyu
通讯作者：
Park, Nam-Gyu
影响因子：
6.7
作者：
Im, Jeong-Hyeok;Lee, Chang-Ryul;Park, Nam-Gyu
通讯作者：
Park, Nam-Gyu
影响因子：
8.4
作者：
Seol, Dong-Jin;Lee, Jin-Wook;Park, Nam-Gyu
通讯作者：
Park, Nam-Gyu