Highly Efficient and Stable Perovskite Solar Cells Based on Monolithically Grained CH3NH3PbI3 Film
Highly Efficient and Stable Perovskite Solar Cells Based on Monolithically Grained CH3NH3PbI3 Film
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基于单片CH3NH3PbI3薄膜的高效稳定钙钛矿太阳能电池
DOI：
10.1002/aenm.201602017
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发表时间：
2017-05-10
影响因子：
27.8
通讯作者：
Cao, Guozhong
中科院分区：
文献类型：
--
作者：
Fei, Chengbin;Li, Bo;Cao, Guozhong
钙钛矿薄膜的合成和生长是实现高效稳定太阳能电池的关键问题。本研究采用两步序贯乙酸乙酯（EA）界面处理将硫脲引入CH3NH3PbI3前驱体中。这是第一次显示出生长致密的微尺寸和整体颗粒的钙钛矿薄膜。x射线衍射图和红外光谱证明，硫脲通过形成中间相MAI中心点PbI2中心点S=C(NH2)，显著影响钙钛矿结晶度和形貌(2)。然后，通过序次EA处理，将经过电荷重组的残余硫脲完全提取出来。该产品改善了光捕获，抑制了缺陷态，增强了电荷的分离和输运。连续EA处理的钙钛矿太阳能电池提供了令人印象深刻的18.46%的功率转换效率和在环境空气中的优异稳定性。更重要的是，EA后处理钙钛矿太阳能电池在超弱光（0.05%太阳）下也具有优异的电压响应，在光电探测器和光电传感器中具有很好的应用前景。
The synthesis and growth of perovskite films with controlled crystallinity and microstructure for highly efficient and stable solar cells is a critical issue. In this work, thiourea is introduced into the CH3NH3PbI3 precursor with two-step sequential ethyl acetate (EA) interfacial processing. This is shown for the first time to grow compact microsized and monolithically grained perovskite films. X-ray diffraction patterns and infrared spectroscopy are used to prove that thiourea significantly impacts the perovskite crystallinity and morphology by forming the intermediate phase MAI center dot PbI2 center dot S=C(NH2)(2). Afterward, the residual thiourea which coursed charge recombination is completely extracted by the sequential EA processing. The product has improved light harvesting, suppressed defect state, and enhanced charge separation and transport. The sequentially EA processed perovskite solar cells offer an impressive 18.46% power conversion efficiency and excellent stability in ambient air. More importantly, the EA postprocessed perovskite solar cells also have excellent voltage response under ultraweak light (0.05% sun) with promising utility in photodetectors and photoelectric sensors.