Facility Agriculture: Application of Solar Facilities in Agriculture【Department of Chemical Engineering / Lin, Chieh-Ting / Associate Professor】
設施農業：光能設施於農業固碳之應用【化學工程學系/林玠廷 副教授】
| 論文篇名 | Stress Mitigation and Defect Passivation in CsPbI 2 Br Solar Cells via Controlled Oxidation and Thermal Stress Control |
| 期刊名稱 | Journal of Materials Chemistry A |
| 發表年份,卷數,起迄頁數 | 2025,13, 35426-35434 |
| 作者 | Kuo, Chih-Ching; Alhabshi, Esra; Sung, Cheng-Yan; Lin, Yi-Sheng; Lin, Yi-Chen; Qiu, Wei- Jia; McLachlan, Martyn A.; Lin, Chieh-Ting(林玠廷)* |
| DOI | 10.1039/D5TA05242D |
| 中文摘要 | 全無機鈣鈦礦因其寬能隙與優異的熱穩定性，而成為串疊型與光伏應用的極具潛力候選材料。元件效能常受到製程中殘餘應力所引起的界面缺陷與不穩定性所限制。本研究系統性地探討退火氣氛、時間與冷卻速率對 CsPbI2Br 薄膜結構與光電特性的影響。我們發現空氣退火可促進 Pb-O 鍵的形成，有效鈍化表面 Pb2+缺陷，並將開路電壓（VOC）從 1.08 V 提升至 1.31 V。然而，過度氧化會引入顯著的殘餘壓縮應力，經 XRD ψ-tilt 量測證實，這將加速元件在儲存過程中的劣化。為了減緩此問題，我們採用慢速冷卻的退火策略，使晶格能夠逐步鬆弛，將內應力從 50.4 MPa 顯著降低至 31.1 MPa。最終我們製得的最佳元件達到 15.3% 的能量轉換效率、1.31 V 的開路電壓、80.8% 的填充因子，並在未封裝的情況下於 600 小時後仍維持超過 95% 的初始效率。本研究突顯了在製備高效率且穩定的 CsPbI2Br 太陽能電池時，缺陷鈍化與應力管理之間的關鍵平衡。 |
| 英文摘要 | All-inorganic perovskites have emerged as promising candidates for tandem and photovoltaic applications due to their wide bandgap and enhanced thermal stability. However, their performance is often limited by interfacial defects and instability induced by residual stress introduced during processing. In this study, we systematically examine the effects of annealing atmosphere, duration, and cooling rate on the structural and optoelectronic properties of CsPbI2Br films. We demonstrate that moderate air annealing facilitates the formation of Pb–O bonds, effectively passivating surface Pb2+ defects and enhancing the open-circuit voltage (VOC) from 1.08 V to 1.31 V. However, excessive oxidation introduces substantial residual compressive stress, as confirmed by XRD ψ-tilt measurements, which accelerates device degradation during storage. To mitigate this, we implement a slow-cooling protocol that allows gradual lattice relaxation, significantly reducing internal stress from 50.4 MPa to 31.1 MPa. This strategy yields a champion device with a power conversion efficiency of 15.3%, VOC of 1.31 V, fill factor of 80.8%, and improved long-term stability, retaining over 95% of initial efficiency after 600 hours without encapsulation. Our findings highlight the critical balance between defect passivation and stress management in achieving high-efficiency and stable CsPbI2Br solar cells. |
| 發表成果與本中心研究主題相關性 | 本研究針對全無機鈣鈦礦太陽能電池的缺陷鈍化與應力管理進行優化，提升元件效率與長期穩定性。高穩定度的鈣鈦礦太陽能技術可應用於農業感測系統、智慧農業設施及偏遠地區離網型能源供應，為永續農業提供穩定且高效的能源解決方案。此成果與本中心推動的「農業能源整合」及「智慧農業能源應用」主題密切相關，對於發展高效率、長壽命之農業能源技術具有實質貢獻。 |
