Flattening Grain‐Boundary Grooves for Perovskite Solar Cells with High Optomechanical Reliability

Abstract

Optomechanical reliability has emerged as an important criterion for evaluating the performance and commercialization potential of perovskite solar cells (PSCs) due to the mechanical‐property mismatch of metal halide perovskites with other device layer. In this work, grain‐boundary grooves, a rarely discussed film microstructural characteristic, are found to impart significant effects on the optomechanical reliability of perovskite–substrate heterointerfaces and thus PSC performance. By pre‐burying iso‐butylammonium chloride additive in the electron‐transport layer (ETL), GB grooves (GBGs) are flattened and an optomechanically reliable perovskite heterointerface that resists photothermal fatigue is created. The improved mechanical integrity of the ETL–perovskite heterointerfaces also benefits the charge transport and chemical stability by facilitating carrier injection and reducing moisture or solvent trapping, respectively. Accordingly, high‐performance PSCs which exhibit efficiency retentions of 94.8% under 440 h damp heat test (85% RH and 85 °C), and 93.0% under 2000 h continuous light soaking are achieved.

Device Physics and Design Principles of Mixed-dimensional Perovskite Solar Cells

“…1i. It is evident that when Nt = 10 16 cm -3 , the 2D/3D PSC exhibits nearly identical J-V behavior in contrast to the 3D PSC, but when Nt = 10 14 cm -3 , the 2D/3D PSC shows a much higher Voc, consistent with the experiment observations [16,17]. In the previous section, we confirmed that the 2D/3D structure can significantly improve the performance of PSCs in specially designed cases.…”

Thermally Crosslinked F‐rich Polymer to Inhibit Lead Leakage for Sustainable Perovskite Solar Cells and Modules

“…As shown in Figure S12, both films showed perovskite characteristic peaks at ~14°and ~28°(corresponding to the 110 and 220 crystal planes, respectively). [16] The film with POF-HDDA exhibited a higher intensity, revealing the higher crystallinity and quality of the film treated by POF-HDDA. There were no additional diffrac-Angewandte Chemie tion peaks after the introduction of POF-HDDA, indicating that POF-HDDA did not enter the perovskite lattice.…”

Thermally Crosslinked F‐rich Polymer to Inhibit Lead Leakage for Sustainable Perovskite Solar Cells and Modules

“…We further investigated the quality of perovskite films with/without POF‐HDDA through X‐ray diffraction (XRD). As shown in Figure S12, both films showed perovskite characteristic peaks at ∼14° and ∼28° (corresponding to the 110 and 220 crystal planes, respectively) [16] . The film with POF‐HDDA exhibited a higher intensity, revealing the higher crystallinity and quality of the film treated by POF‐HDDA.…”

“…As shown in Figure S12, both films showed perovskite characteristic peaks at ~14°and ~28°(corresponding to the 110 and 220 crystal planes, respectively). [16] The film with POF-HDDA exhibited a higher intensity, revealing the higher crystallinity and quality of the film treated by POF-HDDA. There were no additional diffrac-Angewandte Chemie Forschungsartikel tion peaks after the introduction of POF-HDDA, indicating that POF-HDDA did not enter the perovskite lattice.…”