Planar-integrated single-crystalline perovskite photodetectors

Abstract

Hybrid perovskites are promising semiconductors for optoelectronic applications. However, they suffer from morphological disorder that limits their optoelectronic properties and, ultimately, device performance. Recently, perovskite single crystals have been shown to overcome this problem and exhibit impressive improvements: low trap density, low intrinsic carrier concentration, high mobility, and long diffusion length that outperform perovskite-based thin films. These characteristics make the material ideal for realizing photodetection that is simultaneously fast and sensitive; unfortunately, these macroscopic single crystals cannot be grown on a planar substrate, curtailing their potential for optoelectronic integration. Here we produce large-area planar-integrated films made up of large perovskite single crystals. These crystalline films exhibit mobility and diffusion length comparable with those of single crystals. Using this technique, we produced a high-performance light detector showing high gain (above 104 electrons per photon) and high gain-bandwidth product (above 108 Hz) relative to other perovskite-based optical sensors.

Perovskite heterojunction based on CH3NH3PbBr3 single crystal for high-sensitive self-powered photodetector

“…The fabricated MAPbBr 3 photodetector also showed a broadband spectral response upon bottom illumination, since photogenerated charge carriers can be collected efficiently in the vicinity of the electrodes, in accordance with previous reports. 11,19 Moreover, the MAPbBr 3 based photodetector exhibited the peak EQE of 0.14% at 550 nm (Fig. S5 of the supplementary material), which is close to the reported 0.2%, 17 confirming the enhanced performance of our core-shell heterojunction.…”

“…Saidaminov and co-workers produced a planar-integrated single-crystalline MAPbBr 3 (CH 3 NH 3 ¼ MA) photodetector with a large responsivity exceeding 4000 A W À1 at the bias voltage of 5 V using a green monochromatic (k ¼ 520 nm) source. 11 Maculan and coworkers fabricated a MAPbCl 3 single crystal based photodetector with the responsivity of 46.9 mA W À1 at the bias voltage of 15 V under illumination with 365 nm UV light. 12 However, as we all know, the common operation modes of photodetectors based on the photovoltaic effect can be roughly divided into photoconduction and photocurrent, 13 for one-component single-crystal perovskite photodetectors based on the photoconduction mode, a certain operating voltage is indispensable, which makes the photodetectors uneconomical.…”

Solution-processed semiconductors for next-generation photodetectors

“…95 Ultrafast infrared photodetection with moderate quantum efficiencies has been recently reported by Gao et al by the fabrication of nanosized PbSe microstrip photodetectors. 96 From a materials perspective, exciting directions are open by the use of recently reported material platforms.…”

Recent Progress in Single‐Crystalline Perovskite Research Including Crystal Preparation, Property Evaluation, and Applications

“…Over the last 2 years, an increasing number of researchers have begun studying single‐crystalline perovskites, including crystal preparations,21, 27, 28, 43, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65 property studies,21, 27, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80 and applications 56, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91. For example, an extremely long carrier lifetime (up to 20 µs) and carrier diffusion length (175 µm) have been found,21 which has received a great deal of attention.…”