All-back-contact (ABC) architectures for perovskite photovoltaics represent untapped potential for higher efficiency and enhanced durability compared to conventional planar architectures. Interface engineering can be more complex in ABC designs, because both the electron and hole transport layers (ETLs/HTLs) are simultaneously exposed during processing. Herein, we fabricate ABC perovskite solar cells with a non-stabilized current-voltage scan power conversion efficiency >10% by developing complementary interface processing. UV-ozone exposure followed by annealing increases the work function and reduces the defect density of the NiO_x HTL and removed contamination from the TiO₂ ETL, which increases voltage and current collection. We measure the chemical composition of each transport layer interface using photoelectron spectroscopy and then use the resulting trends to inform a two-dimensional drift-diffusion model. The model suggests that further reduction of charged interface defect density, increase in the hole selective contact work function, and passivation of the front surface will enable >20% of ABC devices.

与传统的平面架构相比，钙钛矿型光伏技术的全背接触（ABC）架构具有更高的效率和更高的耐用性。在ABC设计中，界面工程可能会更加复杂，因为电子和空穴传输层（ETL / HTL）在处理过程中会同时暴露。在本文中，我们通过开发互补的界面处理技术来制造ABC钙钛矿型太阳能电池，其不稳定电流-电压扫描功率的转换效率> 10％。暴露于紫外线-臭氧中并随后进行退火可提高功函数并降低NiO _x HTL的缺陷密度，并去除TiO _2中的污染物ETL，可增加电压和电流收集。我们使用光电子能谱法测量每个传输层界面的化学成分，然后使用所得到的趋势来告知二维漂移扩散模型。该模型表明，带电界面缺陷密度的进一步降低，空穴选择性接触功函数的增加以及正面的钝化将使ABC器件的使用率> 20％。