- Halogen-halogen bonds enable improved long-term operational stability of mixed-halide perovskite photovoltaics
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Mixed-halide perovskite provides band-gap tunability, which is essential for tandem solar cell application. However, ion migration inducing phase segregation seriously affects the device's long-term operational stability. The issue thus represents an important challenge for the whole perovskite community and urgently needs effective solutions. We showcase here for the first time that a strong chemical interaction, a halogen-halogen bond, is introduced at the phase interface to suppress the ion migration by increasing the corresponding activation energy. Various characterizations have proved that halogen-halogen bonds form between 2D and 3D phases, which do suppress the halide segregation. As expected, the encapsulated device retains 90% of initial power conversion efficiency (PCE) after maximum power point (MPP) tracking for ~500 h under continuous simulated 1-sun illumination (AM 1.5) in ambient conditions, representing one of the most stable, wide-band-gap, mixed-halide perovskite photovoltaics reported so far.
- Fu, Xinliang,He, Tingwei,Hsu, Hsien-Yi,Jiang, Yuanzhi,Lei, Xiaojuan,Li, Xiaofang,Sun, Pingchuan,Wang, Di,Wang, Mei,Yuan, Mingjian,Zhang, Shifu,Zhao, Dongbing
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supporting information
p. 3131 - 3143
(2021/11/16)
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- REACTION OF AROMATIC COMPOUNDS WITH NUCLEOPHILIC REAGENTS IN LIQUID AMMONIA. XI. REACTIONS OF HEXAFLUOROBENZENE WITH THE SODIUM SALTS OF ETHYLENE GLYCOL AND AMINO- AND MERCAPTOETHANOL
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In the reaction of hexafluorobenzene with sodium ethylene glycolate in liquid ammonia at -40 to 33 deg C 1,2-di(pentafluorophenoxy)ethane and (with an excess of the reagent) 6,7,9,10,16,17,19,20-octafluoro-1,4,11,14-tetraoxaparacyclophane are formed with almost quantitative yields.The reaction of hexafluorobenzene with the sodium salt of aminoethanol under the same conditions gave β-aminoethoxypentafluorobenzene, while the action both of mercaptoethanol itself and of its sodium salt led to substitution of the two para-oriented fluorine atoms by β-hydroxyethylthio groups.
- Kizner, T. A.,Shteingarts, V. D.
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p. 2183 - 2188
(2007/10/02)
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