Impact of CsI concentration, relative humidity, and annealing temperature on lead-free Cs2SnI6 perovskites: Toward visible light photodetectors application

Mokurala, Krishnaiah; Khan, Md. Mohibul Islam; Kumar, Ajit; Jin, Sung Hun

doi:10.1016/j.matlet.2020.127675

Cited by 20 publications

(14 citation statements)

References 15 publications

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“…[26] It has been frequently reported that processing techniques and their parameters determine the chemical composition and thermal stability of the crystallite phase of CSI particles/films (Table S5, Supporting Information). [24][25][26]32,42] Thus, these results substantiate that diluted HI (hydriodic acid) as a solvent, used to form the precursor solution during the facile hydrothermal growth, improves the stability of the chemical composition and crystalline phase, as compared with DMF solvent and different methods in the literature (Figure S3 and Table S5, Supporting Information).…”

Section: Resultssupporting

confidence: 74%

“…The split difference between the two peaks of Cs3d, Sn3d, and I3d was estimated to be 13.95, 8.31, and 11.91 eV, thus confirming that Cs 1+ Sn 4+ , and I 1− valence states are present in the CSI synthesized particles. [17,32,42] The effect of aging time on structural stability for hydrothermally synthesized CSI particles was analyzed by powder X-ray diffraction (XRD) (Figure 1j). These sharp diffraction peaks are consistent with a cubic crystal structure (JCPDS No: 510 466, cubic, space group Fm3m), indicating that the synthesized CSI particles were highly crystalline and structurally stable over 6 months.…”

Section: Resultsmentioning

confidence: 99%

“…[24,[28][29][30] However, compared with metal halides, few studies on CSIbased PDs have been reported in the literature. [17,29,[31][32][33][34] In particular, patterned or array-based CSI PDs and systematic study of their performance sustainability during fabrication in air have been rarely reported or validated in the literature. To ensure system level competitiveness in optical sensor applications, array-based, scalable integration, and fabrication with light sources such as light-emitting diodes (LEDs) (micro-LEDs (μ-LEDs), [35] quantum-dot LEDs (QDLEDs), [36] or others, [37] ) are highly required.…”

mentioning

confidence: 99%

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Physically Detachable and Operationally Stable Cs₂SnI₆ Photodetector Arrays Integrated with µ‐LEDs for Broadband Flexible Optical Systems

et al. 2022

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With the surge in perovskite research, practical features for future applications are desired to be secured, but the reliability of the materials and the use of hazardous Pb are longstanding problems. Here, an air‐stable Cs2SnI6 (CSI) is prepared via diluted hydriodic acid solvent‐based precursor optimization during scalable hydrothermal growth. Materials characterization is performed using various elemental peak analyses and crystallographic identification. The resulting CSI exhibits long‐term operating stability over 6 months, i) at elevated temperatures, ii) in ambient air, and iii) under light illumination from UV to near‐infrared. More importantly, to demonstrate an intriguing class of applications up to system level, physically detachable CSI photodetector arrays (PD‐arrays), integrated with micro‐light‐emitting‐diodes (μ‐LEDs) arrays, are successfully fabricated. In addition, 3 × 3 flexible CSI PDs are fully operational, even in air, and their spatial uniformity in pixels is quantitatively evaluated. The charge‐transport mechanisms of the CSI PDs under light and elevated temperature are assessed via temperature‐dependent characterization from 148 to 373 K, implying the involvement of 3D variable‐range hopping. Multicycle evaluation of the CSI PD‐arrays confirms their operational stability in AC and DC modes, demonstrating this platform's potential benefit for wireless optical interconnection in advanced Si technology.

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Section: Resultssupporting

confidence: 74%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Physically Detachable and Operationally Stable Cs₂SnI₆ Photodetector Arrays Integrated with µ‐LEDs for Broadband Flexible Optical Systems

et al. 2022

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“…More recently, flexible photodetectors have attracted significant research interests due to their broad potential applications in unmanned driving, night vision, and industry automation control, etc. [40,41] Considering the high performance on glass, CsSnBr 3 photodetectors are also fabricated on flexible polyimide (PI). Figure 5a shows the I-V relationship of the flexible devices, inset is the OM image of the flexible photodetectors.…”

Section: Resultsmentioning

confidence: 99%

Tunable Grain Boundary of Lead‐Free All‐Inorganic Perovskite Films for Smart Photodetectors

Liu

Zhang

Liu

et al. 2021

Adv Materials Inter

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methods or vapor-phase method of chemical vapor deposition (CVD) in the literatures. [9][10][11][12] Among them, with the uniform quality in large-scale, perovskites films are widely used in the photoelectronic devices of photodetectors, solar cells, light emitting diodes, and so on. [13][14][15][16][17][18] However, the defects exist at the grain boundaries (GBs) and surfaces, which always bring up carrier transport barriers and nonradiative centers, seriously limiting the photoelectronic performance of perovskites films. [19] To improve the photoelectronic performance, it is highly desired to suppress defects by controlling GBs and surfaces of perovskites films. Nowadays, surfaces/ GBs passivation is the popular defect-suppressed approach. [20][21][22] For example, Li et al. adopted the reducing agent ascorbic acid to passivate the surfaces/GBs defects of solution-prepared CsSnI 3 films successfully, resulting in the high-performance photodetector with high responsivity of 257 mA W −1 , fast response speed of 0.35/1.6 ms, and excellent stability. [21] Furthermore, Wang et al. pointed out that large crystal size of perovskite film prepared by pressure-assisted solvent-engineering method could efficiently improve the photoelectronic performances due to the less GBs defects. [22] In the literatures, beyond the solution-phase growth methods, vapor-phase growth method of CVD has also been proved to be useful for the controllable growth of channel semiconductors of photoelectronic devices with controlled surfaces/ GBs, size, morphology, and crystallization. [11,[23][24][25][26][27][28] Therefore, it is now one of prospective area in growing lead-free all-inorganic perovskites films by CVD method.In this work, the typical lead-free all-inorganic perovskite of CsSnBr 3 is selected as an example to demonstrate the control of surfaces/GBs by a simple CVD method. The as-prepared CsSnBr 3 films are smooth, pinhole-free, and compress with uniform thickness. More importantly, the grain size of asprepared CsSnBr 3 films can be easily controlled by tuning the growth temperature. With the growth temperature increases from 590 to 630 °C, the average grain size of CsSnBr 3 films increases from 4.9 ± 1.5 to 36.7 ± 3.5 µm, indicating the success in GBs reduction. At the same time, the lifetime of photogenerated carrier also increases with the increase of grain size. Owing to the decreased GBs, the as-fabricated CsSnBr 3 film photodetector shows excellent performance with photocurrent up to 760 nA, responsivity up to 9200 mA W −1 and fast

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“…[45] This XRD data also suggests a stoichiometry of Cs 2 SnI 6 (or CsSn 0.5 I 3 ) since a tin deficiency usually leads to the formation of CsI crystals that are also observed here. [48,63] We inkjet-printed our ink (0.6M) to create thin films of 700 µm x 700 µm size. Scanning electron microscopic (SEM) images in Figure 2a shows the formation of an interesting dendritic crystal morphology at 60 °C printing temperature.…”

Section: Morphological Effect From the Surface Temperature Printing Dropspacing And Ink Concentrationmentioning

confidence: 99%

Inkjet Printing of Perovskites for Breaking Performance–Temperature Tradeoffs in Fabric‐Based Thermistors

Kosek

Jahangir

et al. 2020

Adv Funct Materials

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A novel low‐temperature route is developed for inkjet printing of the perovskite Cs2SnI6, to create wearable negative‐temperature‐coefficient thermistors with unprecedented performance on thermally sensitive fabrics. A low processing temperature of 120 °C is achieved by creating a stable and printable ink using binary metal iodide salts, which is thermally transformed into dense Cs2SnI6 crystals after printing. The optimally printed Cs2SnI6 shows a temperature measurement range up to 120 °C, high sensitivity (4400 K), and temperature coefficient of resistivity (0.05 °C−1), and stability under ambient environmental conditions and bending. The approach breaks a critical tradeoff that has hindered wearable fabric‐based thermistors by enabling damage‐free fabrication of devices with commercially comparable performance, evincing significant applications in multifunctional textiles and beyond.

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Impact of CsI concentration, relative humidity, and annealing temperature on lead-free Cs2SnI6 perovskites: Toward visible light photodetectors application

Cited by 20 publications

References 15 publications

Physically Detachable and Operationally Stable Cs₂SnI₆ Photodetector Arrays Integrated with µ‐LEDs for Broadband Flexible Optical Systems

Physically Detachable and Operationally Stable Cs₂SnI₆ Photodetector Arrays Integrated with µ‐LEDs for Broadband Flexible Optical Systems

Tunable Grain Boundary of Lead‐Free All‐Inorganic Perovskite Films for Smart Photodetectors

Inkjet Printing of Perovskites for Breaking Performance–Temperature Tradeoffs in Fabric‐Based Thermistors

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Impact of CsI concentration, relative humidity, and annealing temperature on lead-free Cs2SnI6 perovskites: Toward visible light photodetectors application

Cited by 20 publications

References 15 publications

Physically Detachable and Operationally Stable Cs2SnI6 Photodetector Arrays Integrated with µ‐LEDs for Broadband Flexible Optical Systems

Physically Detachable and Operationally Stable Cs2SnI6 Photodetector Arrays Integrated with µ‐LEDs for Broadband Flexible Optical Systems

Tunable Grain Boundary of Lead‐Free All‐Inorganic Perovskite Films for Smart Photodetectors

Inkjet Printing of Perovskites for Breaking Performance–Temperature Tradeoffs in Fabric‐Based Thermistors

Contact Info

Product

Resources

About

Physically Detachable and Operationally Stable Cs₂SnI₆ Photodetector Arrays Integrated with µ‐LEDs for Broadband Flexible Optical Systems

Physically Detachable and Operationally Stable Cs₂SnI₆ Photodetector Arrays Integrated with µ‐LEDs for Broadband Flexible Optical Systems