Journal
ACS ENERGY LETTERS
Volume 1, Issue 4, Pages 757-763Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.6b00327
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Funding
- National Science Foundation [DMR-1608279]
- Office of Naval Research [N00014-14-1-0246]
- Asian Office of Aerospace RD [FA2386-15-1-4106]
- Department of Energy SunShot [DE-EE 0006710]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Boeing-Johnson Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1608279] Funding Source: National Science Foundation
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The polycrystalline feature of solution processed perovskite film and its ionic nature inevitably incur substantial crystallographic defects, especially at the film surface and the grain boundaries (GBs). Here, a simple defect passivation method was exploited by post-treating CH3NH3PbI3 (MAPbI(3)) film with a rationally selected diammonium iodide. The molecular structure of the used diammonium iodide was discovered to play a critical role in affecting the phase purity of treated MAPbI3. Both NH3I(CH2)(4)NH3I and NH3I(CH2)(2)O(CH2)(2)NH3I (EDBE) induce three-dimensional (3D) to two-dimensional (2D) perovskite phase transformation during the treatment while only NH3I(CH2)(8)NH3I (C8) successfully passivates perovskite surface and GBs without forming 2D perovskite because of the elevated activation energy arising from its unique anti-gauche isomerization. Defect passivation of MAPbI(3) was clearly confirmed by scanning Kelvin probe microscopy (SKPM) and time-resolved photoluminescence (TRPL) studies, which results in the reduced recombination loss in derived devices. Consequently, the perovskite solar cell with C8 passivation showed a much improved power conversion efficiency (PCE) of 17.60% compared to the control device PCE of 14.64%.
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