Effect of the loading of perovskite crystallites on the power conversion properties of carbon based hole-conductor-free mesoscopic perovskite solar cells is studied by varying the concentration of the perovskite precursor from 0.3 to 1.0 mol/L (at given volume of 30 μL). It is observed that, when the concentration is 0.3 mol/L, poor filling is obtained due to relatively low loading of perovskite, and the perovskite solar cells suffer from huge dispersion in efficiencies and large hysteresis index (averaged at 18.29% and up to 34.61%). With increment of the concentration (from 0.4 to 1.0 mol/L), crystallinity of perovskite crystallites is improved according to X-ray diffraction studies, and the lifetime of photo-generated charge carriers is prolonged as reflected by transient photovoltaic (TPV) detection. Meanwhile, the open circuit voltage rises up from 0.86 (±0.03) V to 0.91 (±0.01) V, and the hysteresis index is reduced from 10.02 (±4.67)% to 1.45 (±2.21)%. However, the film conductance of carbon film is decreased due to the loading of perovskite, which deteriorates the fill factor of the devices. Finally, optimized power conversion efficiency is achieved at moderate concentration or 0.6 mol/L, which is 12.59 (±0.40) %, compared to 11.81 (±0.36) % at 1.0 mol/L. Due to the barrier provided by the carbon film against H₂O/O₂, all of the devices showed good shelf-stability, though loading of perovskite is varied in these devices.

通过将钙钛矿前体的浓度从0.3更改为1.0 mol / L（在给定体积为30μL的情况下），研究了钙钛矿微晶负载对无碳介孔介观钙钛矿太阳能电池功率转换性能的影响。观察到，当浓度为0.3 mol / L时，由于钙钛矿的相对较低的填充量而导致填充不良，钙钛矿太阳能电池的效率存在极大的分散性，并且磁滞指数较大（平均为18.29％，最高可达34.61）。 ％）。随着浓度的增加（从0.4到1.0 mol / L），钙钛矿微晶的结晶度根据X射线衍射研究得到了改善，并且光生电荷载流子的寿命得以延长，这通过瞬态光伏（TPV）检测得以反映。同时，开路电压从0.86（±0.03）V上升到0.91（±0.01）V，磁滞指数从10.02（±4.67）％降低到1.45（±2.21）％。然而，由于钙钛矿的负载而降低了碳膜的膜电导，这降低了器件的填充率。最后，在中等浓度或0.6 mol / L时达到了最佳的功率转换效率，为12.59（±0.40）％，而在1.0 mol / L时为11.81（±0.36）％。由于碳膜对H的阻挡 在中等浓度或0.6 mol / L时达到了最佳的功率转换效率，为12.59（±0.40）％，而在1.0 mol / L时为11.81（±0.36）％。由于碳膜对H的阻挡 在中等浓度或0.6 mol / L时达到了最佳的功率转换效率，为12.59（±0.40）％，而在1.0 mol / L时为11.81（±0.36）％。由于碳膜对H的阻挡₂ O / O ₂，尽管钙钛矿的负载在这些设备中各不相同，但所有设备均显示出良好的保存稳定性。