High-performance Self-powered Perovskite Photodetector Based On Cesium Iodide Doped Spiro-OMeTAD Hole Transport Material

Li, Guoxin; Wang, Yukun; Huang, Lixiang; Sun, Wenhong

doi:10.1016/j.jallcom.2022.164432

Cited by 11 publications

(4 citation statements)

References 41 publications

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“…[18][19][20][21][22][23][24][25] However, the overall performance of these photodetectors also depends upon the electron transport layers (ETLs) and hole transport layers (HTLs). Attempts are made to improve the efficiencies of bulk and quasi-2D perovskite-based photodetectors using various ETLs/HTLs such Spiro-OMeTAD, [26] PEDOT:PSS, [27] P3HT, [28] and PTAA [29] as HTLs as well as PCBM [27] as ETLs. Although with the use of organic charge transport materials the performance of perovskite photodetectors has been improved,…”

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confidence: 99%

Strong Photocurrent from Solution‐Processed Ruddlesden–Popper 2D Perovskite–MoS₂ Hybrid Heterojunctions

Ansari

Salunke

Rahil

et al. 2023

Adv Materials Inter

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This study reports overall improvement in structural, morphological, and optoelectronic properties of Ruddlesden-Popper (RP) perovskites of type (BA) 2 (MA) n−1 Pb n I 3n+1 by forming their bulk heterojunction hybrids with fewlayer MoS 2 nanoflakes. RP perovskite-MoS 2 hybrid thin films have shown significantly improved packing and crystallinity compared to pristine perovskites. The presence of MoS 2 at RP perovskite interface has improved the quantum confinement effects and transport of photogenerated charge carriers from perovskite to MoS 2 , due to suitable conduction band of MoS 2 and more number of decay channels. The optoelectronic properties of RP perovskite-MoS 2 hybrids are studied for various MoS 2 concentrations (4.2-25.6 × 10 −3 m) and at optimum concentration (12.8 × 10 −3 m) the photodetectors (n = 2, 4) have shown strong, sharp, and highly stable photocurrent response. At 0.0 V bias, the RP perovskite (n = 4) and MoS 2 (12.8 × 10 −3 m) hybrid-based photodetectors, prepared without any encapsulation, have shown strong photocurrent density of ≈9.8 µA cm −2 under 1 sun illumination, which is ≈17 times higher compared to the pristine RP perovskites-based photodetector (0.6 µA cm −2 ). Further transient photocurrent, performed over 200 cycles for hybrid (n = 4+MoS 2 ) thin film photodetector under laser (λ ex ≈ 405 nm, ≈630 mW cm −2 ) illumination and ambient air conditions has shown highly stable photocurrent with only ≈9.6% reduction in the peak photocurrent density.

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confidence: 99%

Strong Photocurrent from Solution‐Processed Ruddlesden–Popper 2D Perovskite–MoS₂ Hybrid Heterojunctions

Ansari

Salunke

Rahil

et al. 2023

Adv Materials Inter

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“…The weakened role of plasticizer by using Zn(TFSI) 2 and tBP can be assumed by the weight loss as a function of temperature in Figure . While the pristine spiro-MeOTAD exhibits a single step in weight loss (Figure a), spiro-MeOTAD with LiTFSI and tBP demonstrates discrete decay steps (Figure b), where the residual solvent, mainly composed of tBP, rapidly evaporates at the initial heating stage (<200 °C), − whereas the initial weight loss is significantly inhibited with a gentle slope owing to the strong interaction of tBP in the presence of Zn(TFSI) 2 (Figure c).…”

Section: Resultsmentioning

confidence: 99%

Outstanding Thermal Stability of Perovskite Solar Cells Based on Zn(TFSI)₂-Doped Spiro-MeOTAD

Kim

et al. 2023

ACS Appl. Energy Mater.

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Lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) is the most general dopant for 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-MeOTAD), which has been dominantly used as a hole transport material to achieve record efficiencies of perovskite solar cells (PSCs) in spite of resultant poor thermal stability. Recently, zinc(II) bis(trifluoromethanesulfonyl)imide (Zn(TFSI)2) was proposed as an excellent candidate to replace LiTFSI. In this study, the use of Zn(TFSI)2 as a dopant for spiro-MeOTAD is explored to investigate the thermal stability of PSCs. A complexation of Zn(TFSI)2 along with tert-butylpyridine during the doping process of spiro-MeOTAD is favorable for the device operation at 85 °C, while PSCs with LiTFSI demonstrate a rapid performance degradation. Differential scanning calorimetry, X-ray diffraction, and morphology confirm that LiTFSI-doped spiro-MeOTAD is prone to involving higher crystallinity at the elevated temperature, compared to the one with Zn(TFSI)2, directly affecting the photovoltaic performance by aggravating the charge recombination at the interface.

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“…1−6 Correspondingly, the key photodetector parameters used to evaluate these performance factors are high detectivity, extended linear dynamic range (LDR), spectral responsivity (R), noise current, external quantum efficiency (EQE), and rapid photoresponse. 7,8 Nowadays, photoactive materials of commercially available PDs are mainly fabricated using inorganic materials, such as silicon, ZnO, and InGaAs, 9−11 but their higher production cost and longer time-consuming significantly have become the main disadvantage that limits their large-scale manufacturing. As such, the exploration of high-performance photodetectors has emerged as a research focus in the field of optoelectronics.…”

Section: Introductionmentioning

confidence: 99%

“…Photodetectors (PDs), which could capture optical signals over an extensive range of incident photon flux densities and convert them into electrical signals, are essential components in many areas such as imaging, biological sensing, optical communications, space research, memory storage, binary switches, and environmental monitoring. − Correspondingly, the key photodetector parameters used to evaluate these performance factors are high detectivity, extended linear dynamic range (LDR), spectral responsivity (R), noise current, external quantum efficiency (EQE), and rapid photoresponse. , Nowadays, photoactive materials of commercially available PDs are mainly fabricated using inorganic materials, such as silicon, ZnO, and InGaAs, − but their higher production cost and longer time-consuming significantly have become the main disadvantage that limits their large-scale manufacturing. As such, the exploration of high-performance photodetectors has emerged as a research focus in the field of optoelectronics.…”

Section: Introductionmentioning

confidence: 99%

Rubidium Iodide-Doped Spiro-OMeTAD as a Hole-Transporting Material for Efficient Perovskite Photodetectors

Zhang

Wang

et al. 2022

J. Phys. Chem. C

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2,2′,7,7′-Tetrakis-(N,N-di-p-methoxyphenyl-amine)-9,9′-spirobifluorene (spiro-OMeTAD) is one of the broadly used hole transport materials for high-performance perovskite photodetectors. However, to achieve high hole mobility and conductivity, it often requires the addition of additives and dopants with hygroscopic properties similar to bis(trifluoromethane)sulfonamide lithium salt (Li-TFSI) and 4-tert-butylpyridine (TBP), which are forced to undergo aggregation and hydrolysis under environmental conditions, hence leading to pinholes/voids in resultant films. In this work, we added rubidium iodide (RbI) to spiro-OMeTAD together with Li-TFSI and TBP, and the complexation between RbI and TBP prevented the evaporation of TBP that hinders the aggregation of Li-TFSI and reduces the undesired voids. Consequently, RbI-doped spiro-OMeTAD serves as the hole transport layer (HTL) for perovskite photodetectors, enhancing the conductivity and hole transport abilities of the hole transport layer, which also helps to promote energy-level matching with the perovskite layer. The performance of the perovskite photodetector is verified by analyzing the current density–voltage characteristics as well as the transient and dynamic photocurrent response characteristics. Devices with RbI-doped HTLs exhibit a champion specific detectivity approaching 3.77 × 1013 Jones and a linear dynamic range of 114 dB. This work provides a feasible approach to improve the stability of small-molecule-based hole transport materials for perovskite photodetectors.

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High-performance Self-powered Perovskite Photodetector Based On Cesium Iodide Doped Spiro-OMeTAD Hole Transport Material

Cited by 11 publications

References 41 publications

Strong Photocurrent from Solution‐Processed Ruddlesden–Popper 2D Perovskite–MoS₂ Hybrid Heterojunctions

Strong Photocurrent from Solution‐Processed Ruddlesden–Popper 2D Perovskite–MoS₂ Hybrid Heterojunctions

Outstanding Thermal Stability of Perovskite Solar Cells Based on Zn(TFSI)₂-Doped Spiro-MeOTAD

Rubidium Iodide-Doped Spiro-OMeTAD as a Hole-Transporting Material for Efficient Perovskite Photodetectors

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High-performance Self-powered Perovskite Photodetector Based On Cesium Iodide Doped Spiro-OMeTAD Hole Transport Material

Cited by 11 publications

References 41 publications

Strong Photocurrent from Solution‐Processed Ruddlesden–Popper 2D Perovskite–MoS2 Hybrid Heterojunctions

Strong Photocurrent from Solution‐Processed Ruddlesden–Popper 2D Perovskite–MoS2 Hybrid Heterojunctions

Outstanding Thermal Stability of Perovskite Solar Cells Based on Zn(TFSI)2-Doped Spiro-MeOTAD

Rubidium Iodide-Doped Spiro-OMeTAD as a Hole-Transporting Material for Efficient Perovskite Photodetectors

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Strong Photocurrent from Solution‐Processed Ruddlesden–Popper 2D Perovskite–MoS₂ Hybrid Heterojunctions

Strong Photocurrent from Solution‐Processed Ruddlesden–Popper 2D Perovskite–MoS₂ Hybrid Heterojunctions

Outstanding Thermal Stability of Perovskite Solar Cells Based on Zn(TFSI)₂-Doped Spiro-MeOTAD