An Inorganic Hole Conductor for Organo-Lead Halide Perovskite Solar Cells. Improved Hole Conductivity with Copper Iodide
An Inorganic Hole Conductor for Organo-Lead Halide Perovskite Solar Cells. Improved Hole Conductivity with Copper Iodide
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DOI：
10.1021/ja411014k
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发表时间：
2014-01-15
影响因子：
15
通讯作者：
Kamat, Prashant V.
中科院分区：
文献类型：
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作者：
Christians, Jeffrey A.;Fung, Raymond C. M.;Kamat, Prashant V.
有机卤化铅钙钛矿太阳能电池已成为下一代太阳能电池最有前途的候选材料之一。到目前为止，这些钙钛矿型薄膜太阳能电池只使用了有机空穴导电聚合物，这种聚合物往往价格昂贵，空穴迁移率低。在探索用于这些钙钛矿基薄膜光伏的新型无机空穴导电材料的过程中，我们已经确定了碘化铜作为一种可能的替代材料。使用碘化铜，我们成功地获得了很有希望的6.0%的功率转换效率和良好的光电流稳定性。与最好的Spiro-OMeTAD器件相比，开路电压仍然很低，这是由阻抗光谱确定的CuI器件中更高的复合所致。然而，阻抗谱显示，CuI的电导率比Spiro-OMeTAD高2个数量级，这使得填充因子明显更高。减少这些设备中的复合可能使CUI成为钙钛矿型太阳能电池领域Spiro-OMeTAD的经济有效的竞争对手。
Organo-lead halide perovskite solar cells have emerged as one of the most promising candidates for the next generation of solar cells. To date, these perovskite thin film solar cells have exclusively employed organic hole conducting polymers which are often expensive and have low hole mobility. In a quest to explore new inorganic hole conducting materials for these perovskite-based thin film photovoltaics, we have identified copper iodide as a possible alternative. Using copper iodide, we have succeeded in achieving a, promising power conversion efficiency of 6.0% with excellent photo-current stability. The open-circuit voltage, compared to the best spiro-OMeTAD devices, remains low and is attributed to higher recombination in CuI devices as determined by impedance spectroscopy. However, impedance spectroscopy revealed that CuI exhibits 2 orders of magnitude higher electrical conductivity than spiro-OMeTAD which allows for significantly higher fill factors. Reducing the recombination in these devices could render CuI as a cost-effective competitor to spiro-OMeTAD in perovskite solar cells.