期刊
NANO LETTERS
卷 16, 期 2, 页码 1009-1016出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b04060
关键词
Perovskite; solar cell; guanidinium; passivation; open circuit voltage; carrier lifetime
类别
资金
- UC Solar MRPI [442551-YY-69090]
- National Science Foundation [ECCS-1202231, ECCS-1509955]
- Air Force Office of Scientific Research [FA9550-12-1-0074]
- UCLA Internal Funds
- Directorate For Engineering [1509955] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [1509955] Funding Source: National Science Foundation
Hybrid perovskites have shown astonishing power conversion efficiencies owed to their remarkable absorber characteristics including long carrier lifetimes, and a relatively substantial defect tolerance for solution-processed polycrystalline films. However, nonradiative charge carrier recombination, at grain boundaries limits open circuit voltages and consequent performance improvements of perovskite solar cells. Here we address such recombination pathways and demonstrate a passivation effect through guanidinium-based additives to achieve extraordinarily enhanced carrier lifetimes and higher obtainable open circuit voltages. Time-resolved photoluminescence measurements yield carrier lifetimes in guanidinium-pased films an order of magnitude greater than pure-methylammonitin counterparts, giving rise to higher device open circuit voltages and power conversion efficiencies exceeding 17%. A reduction in defect activation energy of over 30% calculated via admittance spectroscopy and confocal fluorescence intensity mapping indicates successful passivation of recombination/trap centers at grain boundaries. We speculate that guanidinium ions serve to suppress formation of iodide vacancies and passivate under-coordinated iodine species at grain boundaries and within the bulk through their hydrogen bonding capability. These results present a simple method for suppressing nonradiative carrier loss in hybrid perovskites to further improve performances toward highly efficient solar cells.
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