Abstract
The large mobilities and carrier lifetimes of hybrid perovskite single crystals and the high atomic numbers of Pb, I and Br make them ideal for X-ray and gamma-ray detection. Here, we report a sensitive X-ray detector made of methylammonium lead bromide perovskite single crystals. A record-high mobility-lifetime product of 1.2 × 10 -2 €...cm 2 €...V -1 and an extremely small surface charge recombination velocity of 64 €...cm €...s -1 are realized by reducing the bulk defects and passivating surface traps. Single-crystal devices with a thickness of 2-3 €...mm show 16.4% detection efficiency at near zero bias under irradiation with continuum X-ray energy up to 50 €...keV. The lowest detectable X-ray dose rate is 0.5 €...μGy air €...s -1 with a sensitivity of 80 €...μC €...Gy 1 air €...cm -2, which is four times higher than the sensitivity achieved with α-Se X-ray detectors. This allows the radiation dose applied to a human body to be reduced for many medical and security check applications.
| Original language | English |
|---|---|
| Pages (from-to) | 333-339 |
| Number of pages | 7 |
| Journal | Nature Photonics |
| Volume | 10 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 1 2016 |
| Externally published | Yes |
Funding
The majority of this work was supported financially by the Defense Threat Reduction Agency (award no. HDTRA1-14-1-0030). M.A.L. acknowledges funding from the European Research Council (ERC starting grant 'Hy-SPOD' no. 306983). Y.G. acknowledges support from the National Science Foundation (grant no. CBET-1437656).
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