Efficient luminescent solar cells based on tailored mixed-cation perovskites.
Efficient luminescent solar cells based on tailored mixed-cation perovskites.
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DOI：
10.1126/sciadv.1501170
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发表时间：
2016-01
期刊：
影响因子：
13.6
通讯作者：
Hagfeldt A
中科院分区：
文献类型：
--
作者：
Bi D;Tress W;Dar MI;Gao P;Luo J;Renevier C;Schenk K;Abate A;Giordano F;Correa Baena JP;Decoppet JD;Zakeeruddin SM;Nazeeruddin MK;Grätzel M;Hagfeldt A
研究人员开发了一种具有高功率转换效率（>20%）和强电致发光产率（0.5%）的钙钛矿太阳能电池。我们报道了一种新的金属卤化物钙钛矿光伏电池，它具有非常高的太阳能-电能转换效率和强烈的电致发光。我们从含有FAI、PbI 2、MABr和PbBr 2的混合物的溶液（其中FA代表甲脒阳离子，MA代表甲基铵阳离子）在单个步骤中生产钙钛矿膜。使用介孔TiO 2和螺-OMeCl 2作为电子和空穴特定的接触，分别，我们制造的钙钛矿太阳能电池，实现了最大的功率转换效率为20.8%的PbI 2/FAI摩尔比为1.05的前体溶液。X射线衍射数据的Rietveld分析揭示，掺入这种膜中的过量PbI 2含量为约3重量%。时间分辨光致发光衰减测量表明，小过量的PbI 2抑制非辐射电荷载流子复合。这反过来又将外部电致发光量子效率提高到约0.5%的值，这是接近最好的硅太阳能电池的钙钛矿光致发光的记录。相应地，在AM 1.5太阳光下，开路光电压达到1.18 V。
Researchers developed a perovskite solar cell with high power-conversion efficiency (>20%) and intense electroluminescence yield (0.5%). We report on a new metal halide perovskite photovoltaic cell that exhibits both very high solar-to-electric power-conversion efficiency and intense electroluminescence. We produce the perovskite films in a single step from a solution containing a mixture of FAI, PbI2, MABr, and PbBr2 (where FA stands for formamidinium cations and MA stands for methylammonium cations). Using mesoporous TiO2 and Spiro-OMeTAD as electron- and hole-specific contacts, respectively, we fabricate perovskite solar cells that achieve a maximum power-conversion efficiency of 20.8% for a PbI2/FAI molar ratio of 1.05 in the precursor solution. Rietveld analysis of x-ray diffraction data reveals that the excess PbI2 content incorporated into such a film is about 3 weight percent. Time-resolved photoluminescence decay measurements show that the small excess of PbI2 suppresses nonradiative charge carrier recombination. This in turn augments the external electroluminescence quantum efficiency to values of about 0.5%, a record for perovskite photovoltaics approaching that of the best silicon solar cells. Correspondingly, the open-circuit photovoltage reaches 1.18 V under AM 1.5 sunlight.