Abstract:
:Fundamental understanding of the charge transport physics of hybrid lead halide perovskite semiconductors is important for advancing their use in high-performance optoelectronics. We use field-effect transistors (FETs) to probe the charge transport mechanism in thin films of methylammonium lead iodide (MAPbI3). We show that through optimization of thin-film microstructure and source-drain contact modifications, it is possible to significantly minimize instability and hysteresis in FET characteristics and demonstrate an electron field-effect mobility (μFET) of 0.5 cm2/Vs at room temperature. Temperature-dependent transport studies revealed a negative coefficient of mobility with three different temperature regimes. On the basis of electrical and spectroscopic studies, we attribute the three different regimes to transport limited by ion migration due to point defects associated with grain boundaries, polarization disorder of the MA+ cations, and thermal vibrations of the lead halide inorganic cages.
journal_name
Sci Advjournal_title
Science advancesauthors
Senanayak SP,Yang B,Thomas TH,Giesbrecht N,Huang W,Gann E,Nair B,Goedel K,Guha S,Moya X,McNeill CR,Docampo P,Sadhanala A,Friend RH,Sirringhaus Hdoi
10.1126/sciadv.1601935subject
Has Abstractpub_date
2017-01-27 00:00:00pages
e1601935issue
1issn
2375-2548pii
1601935journal_volume
3pub_type
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