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《Nature Energ》: Functionalization of perovskite thin films withmoisture-tolerant molecules

Organic-inorganic hybrid perovskite are particularly suited as light-harvesting materials in photovoltaic devices. The power conversion efficiency of perovskite solar cellshas reached certified values of over 20% in just a few years. However, one of the major hindrances for application of these materials in real-world devices is the performance degradation in humid conditions, leading to a rapid loss of photovoltaic response.

 

Recently, Prof. Hua Gui Yang from School of Materials Science and Engineering, demonstrate that hydrophobic tertiary and quaternary alkyl ammonium cations can be successfully assembled on the perovskite surface as efficient water-resisting layers via a facile surface functionalization technique. Such layers can protect the perovskite film under high relative humidity (90 ± 5%) over 30 days. More importantly, devices based on such films can retain the photovoltaic capacities of bulk perovskite with power conversion efficiencies over 15%. Improving the humidity tolerance of perovskite materials is a necessary step towards large scale production of high performance perovskite-based devices under ambient humidity.

 

Damp-proofing perovskites


Cover image: Damp-proofing perovskites

 

This work has been highlighted by an international journal,《Chemistry World》(http://www.rsc.org/chemistryworld/2016/01/ion-coating-perovskite-solar-cells-moisture-stable).Michael Grätzel from the Swiss Federal Institute of Technology in Lausanne believes the research will be of benefit to the community. ‘It’s a nice study and interesting results from a surface chemistry point of view. With these tetra-alkyl ammonium ions, the moisture effect is strongly attenuated – that’s all good news.’

  

More details can be found in: http://www.nature.com/articles/nenergy201516