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Low-temperature solution-processed nanowires of methyl-ammonium lead iodide (CH3NH3PbI3) for photosensing applications.

Massimo Spina (Federal Institute of Technology Lausanne, Switzerland)
Mon, 15/09/2014 - 11:00am to 12:00pm
S16-06 (Graphene Theory Common Seminar Room)
Slaven Garaj
Event Type: 


Methyl-ammonium lead trihalide perovskites (CH3NH3PbX3, X=Br, Cl, I) are solution-processable semiconductors that have recently demonstrated to be excellent materials for optoelectronic applications such as solar cells, lasers and light-emitting diodes. However, despite the intense research to improve the performances of those devices, most of the fundamental questions concerning why these materials are so efficient in generating and transporting photoinduced charges are still unanswered. To investigate the basic physical properties of these materials, besides bulk single crystals, we synthetized nanowires of CH3NH3PbI3. For the first time the photoconductivity of this one- dimensional form of perovskite has been assessed and the influence of parameters such as the number of grain boundaries and the degradation due to the loss of the methyl-ammonium cation have been evaluated. Finally, the interface of this material with graphene has been examined and exploited to improve the sensitivity of photodetectors made with this two-dimensional material.


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