title: Photodiode Response in a CH3NH3PbI3/CH3NH3SnI3Heterojunction.
abstract: Here we report another surprising feature of the methylammonium metal halide material family, the phototunability of the diode response of a heterojunction made of CH3NH3PbI3and its close relative, CH3NH3SnI3. In the dark state the device behaves as a diode, with the Sn homologue acting as the "p" side. The junction is extremely sensitive to illumination. A complete reversal of the diode polarity, the first observation of its kind, is seen when the junction is exposed to red laser light of 25 mW/cm2or larger power density. This finding opens up the possibility for a novel class of optoelectronic devices.
authors.affiliation: Laboratory of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
authors.forename: Massimo
authors.initials: M
authors.lastname: Spina
authors.affiliation: Department of Physics and Astronomy, Stony Brook University , Stony Brook, New York 11790, United States.
authors.forename: László
authors.initials: L
authors.lastname: Mihály
authors.affiliation: Department of Physics and Astronomy, UCLA , Los Angeles, California 90095-1547, United States.
authors.forename: Károly
authors.initials: K
authors.lastname: Holczer
authors.affiliation: Laboratory of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
authors.forename: Bálint
authors.identifier: http://orcid.org/0000-0001-9543-2970
authors.initials: B
authors.lastname: Náfrádi
authors.affiliation: Laboratory of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
authors.forename: Andrea
authors.initials: A
authors.lastname: Pisoni
authors.affiliation: Laboratory of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
authors.forename: László
authors.initials: L
authors.lastname: Forró
authors.affiliation: Laboratory of Physics of Complex Matter, Ecole Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland.
authors.forename: Endre
authors.initials: E
authors.lastname: Horváth
keywords: heterojunction; methylammonium metal halide compounds; perovskite; photodetector; photodiode; photovoltaics