Molecular modulator for stable inverted planar perovskite solar cells with efficiency enhanced by interface engineering
Molecular modulator for stable inverted planar perovskite solar cells with efficiency enhanced by interface engineering
复制标题
用于稳定倒置平面钙钛矿太阳能电池的分子调制器，通过界面工程提高效率
DOI：
10.1039/c9tc03259b
复制
发表时间：
2019
影响因子：
6.4
通讯作者：
Yu Benhai
中科院分区：
文献类型：
--
作者：
赵志强;You Shuai;Huang Jing;Yuan Lin;Xiao Zhenyu;Cao Yang;Cheng Nian;Hu Long;Liu Jingfeng;Yu Benhai
有机/无机有机金属卤化物钙钛矿太阳能电池（PSCs）的研究引起了人们极大的兴趣。然而，它们的性能改进和分子水平的工程仍然具有挑战性的倒置结构。存在于半导体薄膜中的表面陷阱严重影响最终的光伏行为。因此，溶液可加工的和稳定的阴极缓冲层，可以钝化表面陷阱是非常重要的PSC的应用。在这里，我们成功地制造了高性能和稳定的倒置平面PSC采用乙酰丙酮钙（Ca（acac）2），分子调制器，作为阴极界面层（CIL）。基于不同钙钛矿光活性层的PSC的平均功率转换效率得到提高。引人注目的是，发现基于FA0.85MA0.15Pb（I0.85Br0.15）3和基于MAPbI 3的PSC器件分别具有20.15%和18.23%的冠军功率转换效率。重要的是，Ca（acac）2修饰的PSC也具有高稳定性。它们的功率转换效率在储存30天后仅下降了15%，并且与对照装置（没有界面改性）相比，它们显示出更大的抑制滞后。
Hybrid organic/inorganic organometal halide perovskite solar cells (PSCs) have been attracting enormous research interest. However, their performance improvement and engineering at the molecular level remain challenging for the inverted structures. Surface traps present in semiconductor films critically influence ultimate photovoltaic behaviors. A solution-processable and stable cathode buffer layer that can passivate surface traps is thus of great importance for the application of PSCs. Here, we successfully fabricated high performance and stable inverted planar PSCs by employing calcium acetylacetonate (Ca(acac)2), a molecular modulator, as the cathode interfacial layer (CIL). The average power conversion efficiencies of PSCs based on different perovskite photoactive layers were improved. Strikingly, FA0.85MA0.15Pb(I0.85Br0.15)3-based and MAPbI3-based PSC devices were found to have champion power conversion efficiencies of 20.15% and 18.23%, respectively. Importantly, Ca(acac)2-modified PSCs also have high stability. Their power conversion efficiencies decreased by only 15% after 30 days of storage and they show much suppressed hysteresis compared with the control devices (without interfacial modification).