Influence of the grain boundaries on the charge carrier transport of lead-methylammonium iodide (CH3NH3PbI3NW) nanowire-based micro-fabricated photodetectors

László Forró^a, Claudio Grimaldi^a, Massimo Spina^a, Endre Horváth^a

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Endre Horváth, 401
Publication date: 5th February 2015

Despite the intense research in the field of photovoltaics the potential use of methylammonium lead iodide (MAPbI₃) in photodetectors is still largely unexplored. This is partly due to the relatively high intrinsic resistivity and thus low photoelectron collection efficiency of MAPbI₃. Here, we report the effect of the morphology on the electronic properties of two-terminal lead-methylammonium iodide (CH₃NH₃PbI₃) nanowire-based micro-fabricated photodetectors synthetized by slip-coating on a SiO₂ layer covered silicon chip.¹ Wet-chemical modification of the photoactive perovskite layer from an elongated, single domain to a multi-domain (clearly polycrystalline) configuration causes up to a 12-fold reduction of the photocurrent generated in the active zone of the detector. These results clearly demonstrate that in organometal halide perovskite based optoelectronic devices (i.e. solar cells, light-emitting diodes and on-chip coherent lasers) the grain morphology (size, shape and orientation) and the quality of the grain boundaries may play a significant role in terms of the electric field induced charge carrier extraction.

Horvath, E.; Spina, M.; Szekrenyes, Z.; Kamaras, K; Gaal, R; Gachet, D.; Forro, L. Nanowires of Methylammonium Lead Iodide (CH3NH3PbI3) Prepared by Low Temperature Solution-Mediated Crystallization. Nano Letters 2014, 12, 6761-6766.

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