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Effect of alkaline earth metal chloride additives BCl2 (B = Mg, Ca, Sr and Ba) on the photovoltaic performance of FAPbI3 based perovskite solar cells.
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-07-23 , DOI: 10.1039/d0nh00263a Mei Lyu 1 , Do-Kyoung Lee , Nam-Gyu Park
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2020-07-23 , DOI: 10.1039/d0nh00263a Mei Lyu 1 , Do-Kyoung Lee , Nam-Gyu Park
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Additive engineering is known to be an effective method for inducing a simultaneous effect of enlarging the grain size and surface passivation. As compared to the monovalent halides frequently used as additives, divalent halides are relatively less investigated in the role of additives. In this work, we report effects of alkaline earth metal halides BCl2 (B = Mg, Ca, Sr, Ba) as additives on the opto-electronic properties and photovoltaic performance of FAPbI3 based perovskite solar cells (PSCs). A significant improvement in power conversion efficiency (PCE) from 17.27% to 21.11% is observed by MgCl2 addition in the FAPbI3 precursor solution, while a marginal increment for CaCl2 or BaCl2 and a negative effect for SrCl2 is observed. The lattice constant of cubic FAPbI3 is hardly changed by additives, while the crystallinity is improved by MgCl2. The carrier lifetime increases from 40 ns to 287 ns and the trap density is reduced from 1.08 × 1016 cm−3 to 3.19 × 1015 cm−3 by addition of 5 mol% MgCl2, which is responsible for the enhancement in photovoltaic parameters. The steady-state PCE of the PSC with the MgCl2-additive-treated FAPbI3 measured under continuous illumination at the maximum power point remains unchanged for 1500 s.
中文翻译：
碱土金属氯化物添加剂BCl2（B = Mg，Ca，Sr和Ba）对基于FAPbI3的钙钛矿太阳能电池光伏性能的影响。
已知加成工程是引起增大晶粒尺寸和表面钝化的同时效果的有效方法。与经常用作添加剂的一价卤化物相比，对二价卤化物的添加剂作用研究相对较少。在这项工作中，我们报告了碱土金属卤化物BCl 2（B = Mg，Ca，Sr，Ba）作为添加剂对基于FAPbI 3的钙钛矿太阳能电池（PSCs）的光电性能和光伏性能的影响。通过在FAPbI 3前体溶液中添加MgCl 2可以观察到功率转换效率（PCE）从17.27％显着提高到21.11％，而CaCl 2或BaCl 2的边际增加观察到对SrCl 2的负面影响。添加剂几乎不改变立方FAPbI 3的晶格常数，而MgCl 2可改善其结晶度。通过添加5 mol％的MgCl 2，载流子寿命从40 ns增加到287 ns，陷阱密度从1.08×10 16 cm -3降低到3.19×10 15 cm -3，这是提高光伏参数的原因。在最大功率点连续照明下测量的，经过MgCl 2添加剂处理的FAPbI 3的PSC的稳态PCE保持1500 s不变。
更新日期：2020-08-25
中文翻译：
碱土金属氯化物添加剂BCl2（B = Mg，Ca，Sr和Ba）对基于FAPbI3的钙钛矿太阳能电池光伏性能的影响。
已知加成工程是引起增大晶粒尺寸和表面钝化的同时效果的有效方法。与经常用作添加剂的一价卤化物相比，对二价卤化物的添加剂作用研究相对较少。在这项工作中，我们报告了碱土金属卤化物BCl 2（B = Mg，Ca，Sr，Ba）作为添加剂对基于FAPbI 3的钙钛矿太阳能电池（PSCs）的光电性能和光伏性能的影响。通过在FAPbI 3前体溶液中添加MgCl 2可以观察到功率转换效率（PCE）从17.27％显着提高到21.11％，而CaCl 2或BaCl 2的边际增加观察到对SrCl 2的负面影响。添加剂几乎不改变立方FAPbI 3的晶格常数，而MgCl 2可改善其结晶度。通过添加5 mol％的MgCl 2，载流子寿命从40 ns增加到287 ns，陷阱密度从1.08×10 16 cm -3降低到3.19×10 15 cm -3，这是提高光伏参数的原因。在最大功率点连续照明下测量的，经过MgCl 2添加剂处理的FAPbI 3的PSC的稳态PCE保持1500 s不变。
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