Abstract
Defect passivation is crucial to enhancing the performance of perovskite solar cells (PSCs). In this study, we successfully synthesized a novel organic compound named DPPO, which consists of a double phosphonate group. Subsequently, we incorporated DPPO into a perovskite solution. The presence of a P═O group interacting with undercoordinated Pb2+ yielded a perovskite film of superior crystallinity, greater crystal orientation, and smoother surface. Additionally, the addition of DPPO can passivate defect states and enhance upper layer energy level alignment, which will improve carrier extraction and prevent nonradiative recombination. Consequently, an impressive champion efficiency of 24.24% was achieved with a minimized hysteresis. Furthermore, the DPPO-modified PSCs exhibit enhanced durability when exposed to ambient conditions, maintaining 95% of the initial efficiency for 1920 h at an average relative humidity (RH) of 30%.
Original language | English |
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Pages (from-to) | 8850-8859 |
Number of pages | 10 |
Journal | Nano Letters |
Volume | 23 |
Issue number | 19 |
DOIs | |
State | Published - 11 Oct 2023 |
Keywords
- band alignment
- defect passivation
- perovskite solar cell
- phosphonate molecule
- regulate crystallization