论文标题
通过无载体的反溶剂喷雾来保存三束钙钛矿的化学计量法
Preserving the Stoichiometry of Triple-Cation Perovskites by Carrier-Gas-Free Antisolvent Spraying
论文作者
论文摘要
在制造溶液加工的铅卤化物钙钛矿层期间，使用抗溶局越来越普遍。通常，在自旋涂层过程中使用移液施加反溶剂，这通常不可逆地改变了钙钛矿层的组成，从而导致在表面和钙钛矿层的大部分中形成PBI2。在这里，我们证明，通过通过无载体喷涂施加反溶剂，钙钛矿层的化学计量可以更好地保存。因此，在倒置体系结构中制造的三重阳离子光伏设备的光伏性能得到了增强，这主要是由于开路电压的增加。通过探索不同体积的反溶剂，我们表明，喷涂只有60 ul会导致功率转换效率高达21％的设备。此外，用喷雾的抗溶剂电池的太阳能电池比通过移液溶解的那些更稳定。
The use of antisolvents during the fabrication of solution-processed lead halide perovskite layers is increasingly common. Usually, the antisolvent is applied by pipetting during the spin-coating process, which often irreversibly alters the composition of the perovskite layer, resulting in the formation of PbI2 at the surface and bulk of the perovskite layer. Here, we demonstrate that by applying the antisolvent via carrier-gas free spraying, the stoichiometry of the perovskite layer is far better preserved. Consequently, the photovoltaic performance of triple cation photovoltaic devices fabricated in an inverted architecture is enhanced, mainly due to an increase in the open-circuit voltage. By exploring different volumes of antisolvent, we show that spraying as little as 60 uL results in devices with power conversion efficiencies as high as 21%. Moreover, solar cells with sprayed antisolvent are more stable than those fabricated by pipetting the antisolvent.
