In summary, we try to increase the device performance by adding FA~+ to MA~+. As the concentration of MA_(0.8)FA_(0.2) -PbI_(3-y)Cl_y increases, the PCE will increase, and 1.7 M MA_(0.8)FA_(0.2)PbI_(3-y)Cl_y gives the best photovoltaic performance. To get high performance lead-reduced PSCs, we combine Ba~(2+) substitution of Pb~(2+) with 1.7 M MA_(0.8)FA_(0.2) -PbI_(3-y)Cl_y. When 5.0 mol% Ba~(2+) is doped, the best MA_(0.8)FA_(0.2)Ba_(0.05)Pb_(0.95)I_(3-y)Cl_y device gives V_(oc) of 1.06 V, J_(sc) of 22.3 mA/cm~2, FF of 70.4% and PCE of 16.6%.
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机译：总之，我们尝试通过将FA〜+添加到MA〜+来提高设备性能。由于MA_（0.8）FA_（0.2）-PBI_（3-Y）CL_Y的浓度增加，PCE将增加，1.7米MA_（0.8）FA_（0.2）PBI_（3-Y）CL_Y提供了最佳的光伏性能。为了获得高性能铅减少的PSC，我们将PB〜（2+）的Ba〜（2+）替换为1.7 m ma_（0.8）fa_（0.2）-pbi_（3-y）cl_y。当5.0 mol％ba〜（2+）被掺杂时，最好的MA_（0.8）FA_（0.2）BA_（0.05）PB_（0.95）I_（3-Y）CL_Y设备给出了1.06 V，J_的V_（OC）（ SC）22.3 mA / cm〜2，FF为70.4％，PCE为16.6％。
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