Enhancing the efficiency and stability of perovskite solar cells by incorporating CdS and Cd(SCN2H4)(2)Cl-2 into the CH3NH3PbI3 active layer
Enhancing the efficiency and stability of perovskite solar cells by incorporating CdS and Cd(SCN2H4)(2)Cl-2 into the CH3NH3PbI3 active layer
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通过将 CdS 和 Cd(SCN2H4)2Cl2 纳入 CH3NH3PbI3 活性层来提高钙钛矿太阳能电池的效率和稳定性
DOI：
10.1039/c8ta09933b
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发表时间：
2019
影响因子：
11.9
通讯作者：
Wang Mingtai
中科院分区：
文献类型：
--
作者：
Zhu Liangxin;Chen Chong;Li Fumin;Shen Zhitao;Weng Yujuan;Huang Qingsong;Wang Mingtai
为了提高TiO 2基混合介观/平面结构的钙钛矿太阳能电池（PSCs）的电荷分离和传输效率，采用原位合成法将CdS和Cd（SCN 2 H4）2Cl 2引入到CH 3 NH3 PbI 3活性层中，制备了用于PSCs的CdS：Cd（SCN 2 H4）2Cl 2：CH 3 NH3 PbI 3体异质结薄膜。掺入的CdS和Cd（SCN_2 H_4）_2Cl_2提高了钙钛矿薄膜的质量。此外，Cd（SCN_2 H_4）_2Cl_2能有效地降低CH_3NH_3PbI_3晶体表面的缺陷态密度，从而减少了电荷复合，有利于PSC中的电荷输运。此外，第一性原理计算表明，CH 3 NH3 PbI 3中的I原子与CdS中的Cd原子之间存在较强的相互作用，导致CH 3 NH3 PbI 3/CdS界面的电荷重新分布和电荷转移，从而降低了CH 3 NH3 PbI 3：CdS复合体系的能量，导致更有效的电子-空穴分离，提高了钙钛矿体异质结薄膜的结构稳定性.由于上述原因，CdS：Cd（SCN 2 H4）2Cl 2：CH 3 NH3 PbI 3本体异质结电池显示出比具有纯CH 3 NH3 PbI 3的PSC高得多的效率和更好的稳定性。最高效率达到20.1%，是纯CH 3 NH3 PbI 3的17.3%的1.16倍，也远高于先前报道的具有致密/介孔TiO 2膜的CH 3 NH3 PbI 3 PSC。本文的研究结果为提高PSC的结构稳定性和性能提供了新的认识。
To improve the charge separation and transport efficiency in perovskite solar cells (PSCs) with a TiO2-based hybrid mesoscopic/planar architecture, CdS and Cd(SCN2H4)2Cl2 are incorporated into the CH3NH3PbI3 active layer through in situ synthesis to prepare CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 bulk-heterojunction films for PSCs. The incorporated CdS and Cd(SCN2H4)2Cl2 improve the quality of perovskite films. Moreover, Cd(SCN2H4)2Cl2 can effectively reduce the defect state density on the CH3NH3PbI3 crystal surface, which decreases charge recombination and facilitates charge transport in PSCs. Furthermore, first-principles calculations show that the I atom of CH3NH3PbI3 has a strong interaction with the Cd atom of CdS, which induces interfacial charge redistribution and charge transfer at the CH3NH3PbI3/CdS interface and therefore decreases the energy of the CH3NH3PbI3:CdS composite system, leading to more efficient electron–hole separation and improved structural stability of the perovskite bulk-heterojunction film. For the above reasons, the CdS:Cd(SCN2H4)2Cl2:CH3NH3PbI3 bulk-heterojunction cell shows much higher efficiency and better stability than the PSCs with pure CH3NH3PbI3. The highest efficiency reaches 20.1%, which is 1.16 times that (17.3%) of the PSCs with pure CH3NH3PbI3 and is also much higher than those of previously reported CH3NH3PbI3 PSCs with a compact/mesoporous TiO2 film. Our research results may provide a new understanding for improving the structural stability and performance of PSCs.