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Synergistic effects of thiocyanate additive and cesium cations on improving the performance and initial illumination stability of efficient perovskite solar cells
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2018-07-16 , DOI: 10.1039/c8se00200b Changlei Wang 1, 2, 3, 4, 5 , Zhaoning Song 6, 7, 8, 9, 10 , Yue Yu 6, 7, 8, 9, 10 , Dewei Zhao 6, 7, 8, 9, 10 , Rasha A. Awni 6, 7, 8, 9, 10 , Corey R. Grice 6, 7, 8, 9, 10 , Niraj Shrestha 6, 7, 8, 9, 10 , Randy J. Ellingson 6, 7, 8, 9, 10 , Xingzhong Zhao 1, 2, 3, 4, 5 , Yanfa Yan 6, 7, 8, 9, 10
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2018-07-16 , DOI: 10.1039/c8se00200b Changlei Wang 1, 2, 3, 4, 5 , Zhaoning Song 6, 7, 8, 9, 10 , Yue Yu 6, 7, 8, 9, 10 , Dewei Zhao 6, 7, 8, 9, 10 , Rasha A. Awni 6, 7, 8, 9, 10 , Corey R. Grice 6, 7, 8, 9, 10 , Niraj Shrestha 6, 7, 8, 9, 10 , Randy J. Ellingson 6, 7, 8, 9, 10 , Xingzhong Zhao 1, 2, 3, 4, 5 , Yanfa Yan 6, 7, 8, 9, 10
Affiliation
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Mixed triple-cation (cesium (Cs), methylammonium (MA) and formamidinium (FA)) lead tri-iodide perovskite solar cells (PVSCs) exhibit improved optical and thermal stabilities compared to similar PVSCs without Cs. However, the triple-cation PVSCs still suffer from initial instability under illumination. Here, we report on the improvement of device performance and operational illumination stability of PVSCs via simultaneous incorporation of lead thiocyanate (Pb(SCN)2) additive and Cs cations, which enhances the perovskite crystallinity and lowers the trap density. We systematically investigate the impact of Cs on the device performance of PVSCs and demonstrate stable power conversion efficiencies of up to 20%. Importantly, our PVSCs with Cs and SCN additives sustain maximum power conversion efficiencies of about 19% without noticeable degradation during continuous operation for 20 000 seconds under 100 mW cm−2 AM 1.5G illumination. The excellent illumination stability of our PVSCs is mainly attributed to the reduced defect density and suppressed photodecomposition of the perovskite due to the incorporation of nonvolatile Cs ions.
中文翻译：
硫氰酸盐添加剂和铯阳离子对提高高效钙钛矿太阳能电池的性能和初始照明稳定性的协同作用
与不含Cs的类似PVSC相比，混合三阳离子（铯（Cs），甲基铵（MA）和甲ami（FA））三碘化钙钛矿型铅钙钛矿太阳能电池（PVSC）表现出更好的光学和热稳定性。然而，三阳离子PVSC仍然在光照下具有最初的不稳定性。在这里，我们报告通过同时引入硫氰酸铅（Pb（SCN）2）添加剂和Cs阳离子，可增强钙钛矿的结晶度并降低陷阱密度。我们系统地研究了Cs对PVSCs器件性能的影响，并证明了高达20％的稳定功率转换效率。重要的是，我们的带有Cs和SCN添加剂的PVSC在100 mW cm -2 AM 1.5G光照下连续运行20 000秒期间，可保持约19％的最大功率转换效率，而无明显降低。我们的PVSC出色的照明稳定性主要归因于由于引入了非挥发性Cs离子，降低了缺陷密度并降低了钙钛矿的光分解。
更新日期：2018-10-25
中文翻译：
硫氰酸盐添加剂和铯阳离子对提高高效钙钛矿太阳能电池的性能和初始照明稳定性的协同作用
与不含Cs的类似PVSC相比，混合三阳离子（铯（Cs），甲基铵（MA）和甲ami（FA））三碘化钙钛矿型铅钙钛矿太阳能电池（PVSC）表现出更好的光学和热稳定性。然而，三阳离子PVSC仍然在光照下具有最初的不稳定性。在这里，我们报告通过同时引入硫氰酸铅（Pb（SCN）2）添加剂和Cs阳离子，可增强钙钛矿的结晶度并降低陷阱密度。我们系统地研究了Cs对PVSCs器件性能的影响，并证明了高达20％的稳定功率转换效率。重要的是，我们的带有Cs和SCN添加剂的PVSC在100 mW cm -2 AM 1.5G光照下连续运行20 000秒期间，可保持约19％的最大功率转换效率，而无明显降低。我们的PVSC出色的照明稳定性主要归因于由于引入了非挥发性Cs离子，降低了缺陷密度并降低了钙钛矿的光分解。
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