Solution-Processed Epitaxial Growth of MAPbI3 Single-Crystal Films for Highly Stable Photodetectors

Xu, Yubing; Wang, Xin; Zhao, Jingda; Pan, Yuzhu; Li, Yuwei; Elemike, Elias E.; Li, Qing; Zhang, Xiaobing; Chen, Jing; Zhao, Zhiwei; Akram, Javed; Bae, Byung Seong; Bin, Suhaidi; Lei, Wei

doi:10.3389/fmats.2021.651957

Cited by 14 publications

(8 citation statements)

References 57 publications

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“…In this study, n -MAPbBr 3 served as the substrate and the MAPbI 3– x Br x and MAPbI 3 epitaxial layers were grown on the opposite sides of the substrate. As previously reported, the MAPbI 3 epitaxial layer on the MAPbBr 3 PSC exhibited excellent optoelectrical performance . Scanning electron microscopy (SEM) images and energy-dispersive X-ray spectroscopy (EDX) mappings of the cross section of our dual-mode PD revealed that the Br – ions were incorporated into the MAPbI 3– x Br x perovskite lattice (Figure d).…”

Section: Resultssupporting

confidence: 75%

“…As previously reported, the MAPbI 3 epitaxial layer on the MAPbBr 3 PSC exhibited excellent optoelectrical performance. 28 Scanning electron microscopy (SEM) images and energy-dispersive X-ray spectroscopy (EDX) mappings of the cross section of our dual-mode PD revealed that the Br − ions were incorporated into the MAPbI 3−x Br x perovskite lattice (Figure 1d). To evaluate the doping ratio of Br − in MAPbI 3−x Br x epitaxial layer and Bi 3+ in the n-MAPbBr 3 substrate, EDX was conducted as displayed in Figure S2.…”

Section: Resultsmentioning

confidence: 96%

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Electrically Modulated Near-Infrared/Visible Light Dual-Mode Perovskite Photodetectors

Zhao

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Dual-mode photodetectors (PDs) have attracted increasing interest owing to their potential optoelectrical applications. However, the widespread use of PDs is still limited by the high cost of epitaxial semiconductors. In contrast, the solution processability and wide spectral tunability of perovskites have led to the development of various inexpensive and highperformance optoelectronic devices. In this study, we develop a high-performance electronically modulated dual-mode PD with near-infrared (NIR) narrowband and visible light broadband detection based on organic−inorganic hybrid methylammonium lead halide perovskite (MAPbX 3 ; MA = CH 3 NH 3 and X = Cl, Br, and I) single crystals with a pnp configuration. The operating mode of the dual-mode PD can be switched according to voltage bias polarity because the photon absorption region and carrier transport performance are tuned at different bias voltages. The dual-mode PD exhibits a NIR light responsivity of 0.244 A/W and a narrow full width at half-maximum of ∼12 nm at 820 nm at positive voltages and an average visible light responsivity of ∼0.13 A/W at negative voltages. The detectivities of both modes are high (∼10 12 Jones), and the linear dynamic range is wide (>100 dB). Our study provides a new method for fabricating multifunctional PDs and can expand their application in integrated imaging systems.

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Section: Resultssupporting

confidence: 75%

Section: Resultsmentioning

confidence: 96%

Electrically Modulated Near-Infrared/Visible Light Dual-Mode Perovskite Photodetectors

Zhao

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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“…The samples used in this work are MAPbI 3 polycrystalline grains and thin films. Firstly, high-quality MAPbI 3 single-crystals were synthesized according to the literature [60][61][62] . The photographs of the MAPbI 3 single crystal and the corresponding X-ray diffraction (XRD) pattern are given in Figs.…”

Section: Resultsmentioning

confidence: 99%

Photoinduced large polaron transport and dynamics in organic–inorganic hybrid lead halide perovskite with terahertz probes

et al. 2022

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Organic-inorganic hybrid metal halide perovskites (MHPs) have attracted tremendous attention for optoelectronic applications. The long photocarrier lifetime and moderate carrier mobility have been proposed as results of the large polaron formation in MHPs. However, it is challenging to measure the effective mass and carrier scattering parameters of the photogenerated large polarons in the ultrafast carrier recombination dynamics. Here, we show, in a one-step spectroscopic method, that the optical-pump and terahertz-electromagnetic probe (OPTP) technique allows us to access the nature of interplay of photoexcited unbound charge carriers and optical phonons in polycrystalline CH3NH3PbI3 (MAPbI3) of about 10 μm grain size. Firstly, we demonstrate a direct spectral evidence of the large polarons in polycrystalline MAPbI3. Using the Drude–Smith–Lorentz model along with the Frӧhlich-type electron-phonon (e-ph) coupling, we determine the effective mass and scattering parameters of photogenerated polaronic carriers. We discover that the resulting moderate polaronic carrier mobility is mainly influenced by the enhanced carrier scattering, rather than the polaron mass enhancement. While, the formation of large polarons in MAPbI3 polycrystalline grains results in a long charge carrier lifetime at room temperature. Our results provide crucial information about the photo-physics of MAPbI3 and are indispensable for optoelectronic device development with better performance.

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“…The lattice match rate is sufficient to achieve epitaxial growth. [34][35][36][37][38] In the fabrication process of hetero-PD, high-quality (doped MAPbCl 3 ) PSCs are used as substrates, as shown in Figure 1c. Intrinsic MAPbBr 2.5 Cl 0.5 and doped MAPbBr 3 were epitaxially grown on the substrates.…”

Section: Resultsmentioning

confidence: 99%

High Spectral‐Rejection‐Ratio Narrowband Photodetectors Based on Perovskite Heterojunctions

Wang

Pan

et al. 2022

Adv Elect Materials

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narrowband photodetection, only narrowband optical spectra are required, whereas the background noise signal caused by the photon wavelength beyond the narrowband must be suppressed. Thus, the spectral rejection ratio narrowband spectral response wide spectra response 100% ×       is an important parameter for describing the ability of photodetectors to discriminate narrowband photons from those of wide spectra. [12][13][14][15] Typically, narrowband photodetectors rely on a combination of bulky optical filters and broadband photodetectors, which impede their less costly fabrication and miniaturization. [16,5,15] Hence, the development of nonopticalfilter narrowband photodetectors is important to miniaturization.Recently, the use of nonoptical-filter narrowband photodetectors made of MAPbX 3 perovskites have been reported in two main structures. The first is the vertical Schottky structure of Au/ MAPbX 3 perovskite single crystals (PSCs)/ (FTO,Ga), which is highly dependent on defect density differences between the MAPbX 3 PSC surface and the inside of the MAPbX 3 PSC bulk. [17,18,6,19] Owing to surface charge recombination, a surface with high density of traps can absorb short-wavelength photons, whereas the charges Narrowband photodetection provides important information in a specific wavelength range. Specially, the use of nonoptical-filter narrowband photodetectors based on MAPbX 3 (MA = CH 3 NH 3 ; X = Cl, Br, I) perovskites is reported of great potential. However, current MAPbX 3 -based narrowband photodetectors have to sacrifice their photocurrent and response speed to achieve an acceptable spectral rejection ratio. In this work, a new type of heterojunction photodetector (hetero-PD) with a structure of (n-type doped MAPbCl 3 )/(intrinsic MAPbBr 2.5 Cl 0.5 )/(n-type doped MAPbBr 3 ) via epitaxial growth is demonstrated as a narrowband photodetector. Through optical bandgap engineering, photons with different wavelength can be absorbed in different layers. Owing to the n-i-n energy band structure, most external bias would apply on a tiny region near the n-i heterojunction. Besides, the energy barriers in the heterojunctions can block holes from injection and collection, resulting in low-noise electron-only hetero-PDs. By sufficiently suppressing the background noise from short-wavelength photons, hetero-PDs are capable of achieving a high spectral rejection ratio of 98.1% under an electrical field of 8 V cm −1 . Moreover, hetero-PDs exhibit a high external quantum efficiency value of 45%, a narrow full width at half-maximum of 13 nm, and a response time of 1.35 µs.

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Solution-Processed Epitaxial Growth of MAPbI3 Single-Crystal Films for Highly Stable Photodetectors

Cited by 14 publications

References 57 publications

Electrically Modulated Near-Infrared/Visible Light Dual-Mode Perovskite Photodetectors

Electrically Modulated Near-Infrared/Visible Light Dual-Mode Perovskite Photodetectors

Photoinduced large polaron transport and dynamics in organic–inorganic hybrid lead halide perovskite with terahertz probes

High Spectral‐Rejection‐Ratio Narrowband Photodetectors Based on Perovskite Heterojunctions

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