Observation of Dynamic Doping Mechanism in Perovskite Radiation Detectors.

Ballistic-like space-charge-limited currents in halide perovskites at room temperature

“…1(c) shows three different perovskite samples showing some section of the dark J-V curve with n % 3=2, characterized in our previous and simultaneous works and measured in room conditions with a Keithley Source-meter 2612B. 18,19 The chromium contacted 1-mm-thick polycrystalline (pc) pellet (Cr/pc-MAPbI 3 /Cr) 18 reports the lower currents, and the 2 mm-thick single crystal (sc) of the CH 3 NH 3 PbBr 3 (Cr/sc-MAPbBr 3 /Cr) 20 sample presents the shorter voltage section with the J / V 3=2 trend, whereas the platinum contacted 3 mm-thick CsPbBr 3 sample (Pt/sc-CsPbBr 3 /Pt) 19 seems to behave the closest to the seemly ballistic comportment.…”

“…The BVM model corresponds to an electrostatic potential situation somehow in between the Mott-Gurney law of SCLC (electronic bulk effect) and the quadratic case of the rectifying junctions (mobile ions depletion effect toward interfaces). Moreover, the idea of gradients in the transport properties, such as in (9), has also been proposed in the ionic dynamic doping model, 18,20,34 where the biasing produces the accumulation of mobile ions toward one electrode with slow kinetics. Consequently, one can substitute Eq.…”