Abstract
Although all-inorganic perovskite solar cells (PSCs) demonstrate high thermal stability, cesium-lead halide perovskites with high iodine content suffer from poor stability of the black phase (α-phase). In this study, it is demonstrated that incorporating InCl 3 into the host perovskite lattice helps to inhibit the formation of yellow phase (δ-phase) perovskite and thereby enhances the long-term ambient stability. The enhanced stability is achieved by a strategy for the structural reconstruction of CsPbI 2 Br perovskite by means of In 3+ and Cl − codoping, which gives rise to a significant improvement in the overall spatial symmetry with a closely packed atom arrangement due to the crystal structure transformation from orthorhombic (Pnma) to cubic (Pm-3m). In addition, a novel thermal radiation heating method that further improves the uniformity of the perovskite thin films is presented. This approach enables the construction of all-inorganic InCl 3 :CsPbI 2 Br PSCs with a champion power conversion efficiency of 13.74% for a small-area device (0.09 cm 2 ) and 11.4% for a large-area device (1.00 cm 2 ).
| Original language | English |
|---|---|
| Article number | 1803572 |
| Journal | Advanced Energy Materials |
| Volume | 9 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 14 Feb 2019 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Research Keywords
- all-inorganic perovskite solar cells
- phase stability
- structural reconstruction
- thermal stability
