Charge injection and trapping at perovskite interfaces with organic hole transporting materials of different ionization energies

The extraction of photogenerated holes from CH3NH3PbI3 is crucial in perovskite solar cells. Understanding the main parameters that influence this process is essential to design materials and devices with improved efficiency. A series of vacuum deposited hole transporting materials (HTMs) of differe...

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Published in:APL materials 2019-04, Vol.7 (4), p.041115-041115-8
Main Authors: Droseros, Nikolaos, Dänekamp, Benedikt, Tsokkou, Demetra, Boix, Pablo P., Banerji, Natalie
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description The extraction of photogenerated holes from CH3NH3PbI3 is crucial in perovskite solar cells. Understanding the main parameters that influence this process is essential to design materials and devices with improved efficiency. A series of vacuum deposited hole transporting materials (HTMs) of different ionization energies, used in efficient photovoltaic devices, are studied here by means of femtosecond transient absorption spectroscopy. We find that ultrafast charge injection from the perovskite into the different HTMs (
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