Enhancing efficiency of perovskite solar cells by reducing defects through imidazolium cation incorporation
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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Detail(s)
Original language | English |
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Pages (from-to) | 161-168 |
Journal / Publication | Materials Today Energy |
Volume | 7 |
Online published | 16 Oct 2017 |
Publication status | Published - Mar 2018 |
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Abstract
Regarding the polycrystalline nature of the solution-processed organic/inorganic hybrid perovskite (ABX3) thin films, how to enhance the crystallinity of the prepared perovskite films has become the most critical issue for realizing high-performance perovskite solar cells. Recently, A-site cation engineering has been reported to effectively modulate the perovskite crystallization. Nevertheless, owing to the limited tolerance space of three-dimensional (3D) perovskite, the suitable A-site cations are extremely restrained to methylammonium (MA), formamidinium (FA), or Cesium (Cs) cations. We herein described a new A-site cation engineering for CH3NH3PbI3 by utilizing imidazolium (IA) cation that affords a tolerance factor of 1 to modulate the perovskite crystallization. The mixed MA0.95IA0.05PbI3 film was revealed to possess an improved film quality and crystallinity as compared to the pristine MAPbI3 film, which thereby enables a much increased carrier lifetime as a result of the reduced defect density. Consequently, its derived solar cell device yields both enhanced efficiency (17%) and stability, outperforming the control MAPbI3 device showing an inferior efficiency of 15.7%.
Research Area(s)
- Defect passivation, Imidazolium cation, Perovskite solar cells, Photovoltaic performance, Tolerance factor
Citation Format(s)
Enhancing efficiency of perovskite solar cells by reducing defects through imidazolium cation incorporation. / Wang, Qin; Lin, Francis; Chueh, Chu-Chen; Zhao, Ting; Eslamian, Morteza; Jen, Alex K.-Y.
In: Materials Today Energy, Vol. 7, 03.2018, p. 161-168.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review