A laminar MAPbBr3/MAPbBr3−xIx graded heterojunction single crystal for enhancing charge extraction and optoelectronic performance

Li, Wenguang; Wang, Xudong; Liao, Jinfeng; Wei, Zefeng; Xu, Yangfan; Chen, Liqun; Kuang, Dai‐Bin

doi:10.1039/c9tc00972h

Cited by 24 publications

(12 citation statements)

References 43 publications

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“…The series of distinct characteristic peaks and small full width at half-maximum of the MAPbCl 3 PSC on epitaxial MAPbBr 2.5 Cl 0.5 indicate the high-quality crystallization. In addition, its diffraction peak positions nearly overlap with MAPbBr 2.5 Cl 0.5 PSC and MAPbCl 3 PSC, which corresponds to the reported graded heterojunction (Li et al, 2019b ). The existence of main and secondary peaks in the XRD spectra of MAPbCl 3 PSC on epitaxial MAPbBr 2.5 Cl 0.5 is attributed to the diffraction of both thin epitaxial MAPbBr 2.5 Cl 0.5 layer and MAPbCl 3 layer.…”

Section: Resultssupporting

confidence: 55%

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Enhanced Performance of Perovskite Single-Crystal Photodiodes by Epitaxial Hole Blocking Layer

Pan

Wang

et al. 2020

Front. Chem.

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Introducing hole/electron transporting and blocking layers is considered to enhance the performance of electronic devices based on organic–inorganic hybrid halide perovskite single crystals (PSCs). In many photodiodes, the hole/electron transporting or blocking materials are spin-coated or thermal-evaporated on PSC to fabricate heterojunctions. However, the heterojunction interfaces due to lattice mismatch between hole/electron, transporting or blocking materials and perovskites easily form traps and cracks, which cause noise and leakage current. Besides, these low-mobility transporting layers increase the difficulty of transporting carriers generated by photons to the electrode; hence, they also increase the response time for photo detection. In the present study, MAPbCl 3 -MAPbBr 2.5 Cl 0.5 heterojunction interfaces were realized by liquid-phase epitaxy, in which MAPbBr 2.5 Cl 0.5 PSC acts as an active layer and MAPbCl 3 PSC acts as a hole blocking layer (HBL). Our PIN photodiodes with epitaxial MAPbCl 3 PSC as HBL show better performance in dark current, light responsivity, stability, and response time than the photodiodes with spin-coated organic PCBM as HBL. These results suggest that the heterojunction interface formed between two bulk PSCs with different halide compositions by epitaxy growth is very useful for effectively blocking the injected charges under high external electric field, which could improve the collection of photo-generated carriers and hereby enhance the detection performance of the photodiode. Furthermore, the PIN photodiodes made of PSC with epitaxial HBL show the sensitivities of 7.08 mC Gy air −1 cm −2 , 4.04 mC Gy air −1 cm −2 , and 2.38 mC Gy air −1 cm −2 for 40-keV, 60-keV, and 80-keV X-ray, respectively.

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Section: Resultssupporting

confidence: 55%

“…Therefore, it is feasible to fabricate lattice-matched heterojunctions with the energy band gradient between MAPbBr 2.5 Cl 0.5 PSC and MAPbCl 3 PSC by epitaxy growth. This would significantly decrease the leaking current and accelerate carrier transport, leading to a high-performance PSC photodetector (Li et al, 2019b ).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Performance of Perovskite Single-Crystal Photodiodes by Epitaxial Hole Blocking Layer

Pan

Wang

et al. 2020

Front. Chem.

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“…On the other hand, Li et al showed conversion of MAPbBr 3 to MAPbBr 3– x I x using a gas–solid exchange reaction. 59 Another approach to this method is the seeded space-limited crystallization and printing approach. Gu et al prepared CsPbBr 3 , MAPbCl 3 , MAPbI 3 , (BA) 2 PbBr 4 , and (BA) 2 (MA) 3 Pb 4 Br 13 SCs using the general printing approach, as shown in Figure 5 d. 60 Yue et al confined the seed crystal of MAPbI 3 between two glass substrates to induce crystallization and produced SCs with thicknesses ∼50 μm and fabricated a solar cell with the architecture of ITO/PEDOT:PSS/MAPbI 3 /PCBM/Ag.…”

Section: Single-crystal Growth Methodsmentioning

confidence: 99%

Recent Progress in Growth of Single-Crystal Perovskites for Photovoltaic Applications

et al. 2021

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The growth of high-quality single-crystal (SC) perovskite films is a great strategy for the fabrication of defect-free perovskite solar cells (PSCs) with photovoltaic parameters close to the theoretical limit, which resulted in high efficiency and superior stability of the device. Plenty of growth methods for perovskite SCs are available to achieve a maximum power conversion efficiency (PCE) surpassing 21% for SC-based PSCs. However, there is still a lot of room to further push the efficiency by considering new crystal growth techniques, interface engineering, passivation approaches, and additive engineering. In this review, we summarize the recent progress in the growth of SC-based perovskite films for the fabrication of high-efficiency and stable PSCs. We describe the impact of SC growth of perovskite films and their quality on the device performance and stability, compared with the commonly used polycrystalline perovskite films. In the last section, the challenges and potential of SCs in PSCs are also covered for future development.

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“…After the perovskite film was prepared by the spaceconfined method, it could be converted into halide gradient perovskite film to further improve the performance of photoelectric devices. A facile conversion method was reported by Li et al Based on their previous work of growing perovskite by the space-confined method [35], they prepared halide gradient perovskite films by a space-limited inverse temperature crystallization growth method and a subsequent gaseous halide exchange process [75]. The gas-solid exchange process is illustrated in Fig.…”

Section: Components Regulatingmentioning

confidence: 99%

Space-confined growth of metal halide perovskite crystal films

Liu

Zeng

et al. 2020

Nano Res.

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Metal halide perovskites, as a new generation of optoelectronic materials, have attracted a great deal of interest due to their remarkable intrinsic properties. Due to the excellent optoelectronic properties, the perovskite crystals are widely used in lasers, photodetectors, X-ray detectors and solar cells. Considering the device performance and fabrication requirements, proper thickness of the crystal is required to avoid carrier loss and simultaneously ensure sufficient light absorption, which can realize the full potential of its excellent carrier transport property. Thus, the fabrication of perovskite crystal in a thin film with an adjustable thickness is highly desirable. The space-confined method has been demonstrated to be an effective way of preparing perovskite with controlled thickness. In this method, the thickness of perovskite can be regulated flexibly in a geometric confined space. Moreover, the size, quality and architecture of perovskite crystal films are also major concerns for practical photoelectric devices, which can also be optimized by the space-confined method owing to its good adaptability towards various modified strategies. In a word, the space-confined method is not only a simple and conventional way to adjust the thickness of perovskite crystal films, but also provides a platform to optimize their size, quality and architecture through applying appropriate strategies to the confined space. Herein, we review the space-confined growth of perovskite crystal films. Particularly, various modified strategies based on the space-confined method applied to the optimization of thickness, size, quality and architecture are highlighted. Then the stability investigating and component regulating of perovskite crystal films would be also mentioned. Furthermore, the correlation between the perovskite thickness and the device performance is discussed. Finally, several key challenges and proposed solutions of perovskite thin films based on the space-confined method are discussed.

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A laminar MAPbBr₃/MAPbBr_3−xI_x graded heterojunction single crystal for enhancing charge extraction and optoelectronic performance

Abstract: A laminar MAPbBr3/MAPbBr3−xIx graded heterojunction single crystal forms a graded valence band structure, resulting in enhanced hole extraction as well as superior photodetection performance.

Cited by 24 publications

References 43 publications

Enhanced Performance of Perovskite Single-Crystal Photodiodes by Epitaxial Hole Blocking Layer

Enhanced Performance of Perovskite Single-Crystal Photodiodes by Epitaxial Hole Blocking Layer

Recent Progress in Growth of Single-Crystal Perovskites for Photovoltaic Applications

Space-confined growth of metal halide perovskite crystal films

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