연구
Research Outcome
미래를 창조하는 포스텍 화학공학과
Synergy Effect of a π-Conjugated Ionic Compound: Dual Interfacial Energy Level Regulation and Passivation to Promote VOC and Stability of Planar Perovskite Solar Cells
- Title of paper
- Synergy Effect of a π-Conjugated Ionic Compound: Dual Interfacial Energy Level Regulation and Passivation to Promote VOC and Stability of Planar Perovskite Solar Cells
- Author
- [박태호 교수 연구실] π-전자 이온 화합물을 통한 페로브스카이트 태양전지의 성능 및 안정성 개선
- Publication in journal
- Angew. Chem. Int. Ed, 2022, e202117303
- Publication date
- 20220120
[Abstract]
Defects and energy offsets at the bulk and heterojunction interfaces of perovskite are detrimental to the efficiency and stability of perovskite solar cells (PSCs). Herein, we designed an amphiphilic π-conjugated ionic compound (QAPyBF 4 ), implementing simultaneous defects passivation and interface energy level alignments. The p-type conjugated cations passivated the surface trap states and optimized energy alignment at the perovskite/hole transport layer. The highly electronegative [BF 4 ] - enriched at the SnO 2 interface featured desired band alignment due to the dipole moment of this interlayer. The planar n-i-p PSC had an efficiency of 23.1% with V OC of 1.2 V. Notably, the synergy effect elevated the intrinsic endothermic decomposition temperature of the perovskite. The modified devices showed excellent long-term thermal (85 °C) and operational stability at the maximum power point for 1000 h at 45 °C under continuous one-sun illumination with no appreciable efficiency loss.
DOI: https://doi.org/10.1002/ange.202117303
Link:https://onlinelibrary.wiley.com/doi/10.1002/ange.202117303
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