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Efficient inorganic CsPbI2Br perovskite indoor photovoltaics demonstrated via slower crystallization by incorporated dimethylammonium iodide
EcoMat ( IF 10.7 ) Pub Date : 2022-11-10 , DOI: 10.1002/eom2.12303
Seongyun Choi 1 , Hyong Joon Lee 1 , Jin Hyuck Heo 1 , Sang Hyuk Im 1
Affiliation  

Although inorganic CsPbI2Br perovskite has an ideal bandgap for indoor photovoltaics (IPVs), its poor solubility causes rapid crystallization during spin-coating process and deteriorates the performance of IPVs. Here, efficient CsPbI2Br IPVs are demonstrated through slower crystallization by introduction of dimethylammonium iodide (DMAI), which has better solubility in perovskite solvent compared to the inorganic CsPbI2Br and is easily eliminated by thermal-annealing. Consequently, the incorporation of DMAI results in the CsPbI2Br film with enlarged crystal grains with reduced interface traps. In addition, the incorporated DMAI orients preferentially the CsPbI2Br crystals to expose (110) facet. Through controlling the amount of incorporated DMAI, eventually the CsPbI2Br IPVs with 35.22% (0.096 cm2), 35.08% (1 cm2), and 29.80% (25 cm2) of power conversion efficiency under illumination of 1000 lux light-emitting diode lamp are achieved. The unencapsulated device has good long-term stability under 1000 lux lamp for 1000 h.

中文翻译:

高效无机 CsPbI2Br 钙钛矿室内光伏器件通过掺入二甲基碘化铵的较慢结晶得到证明

尽管无机 CsPbI 2 Br 钙钛矿具有用于室内光伏(IPV)的理想带隙,但其溶解性差会导致旋涂过程中快速结晶并降低 IPV 的性能。在这里,高效的 CsPbI 2 Br IPVs 通过引入二甲基碘化铵 (DMAI) 的较慢结晶得到证明,与无机 CsPbI 2 Br 相比,二甲基碘化铵在钙钛矿溶剂中具有更好的溶解度,并且很容易通过热退火消除。因此,DMAI 的加入导致 CsPbI 2 Br 薄膜晶粒增大,界面陷阱减少。此外,合并的 DMAI 优先定向 CsPbI 2Br 晶体露出 (110) 面。通过控制掺入 DMAI 的量,最终 CsPbI 2 Br IPV在 1000 勒克斯光照下的功率转换效率分别为 35.22%(0.096 cm 2)、35.08%(1 cm 2)和 29.80%(25 cm 2 )-发光二极管灯的实现。未封装的器件在 1000 勒克斯灯下 1000 小时具有良好的长期稳定性。
更新日期:2022-11-10
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