Perovskite single crystals: physical properties and optoelectronic applications

Li, Chen; Sun, Haoxuan; Gan, Shan; Dou, Da; Li, Liang

doi:10.1088/2752-5724/ace8aa

Cited by 11 publications

(2 citation statements)

References 181 publications

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“…Due to the potential to improve stability and elimination of hysteresis, the inverted perovskite solar cells (PSCs) have attracted much attention, in which hole-transporting materials (HTMs) plays an important role in achieving high-efficiency inverted PSCs. [1][2][3][4][5][6][7][8][9][10] Organic materials of poly (3,4-ethylene dioxythiophene):poly (4-styrene sulfonate) (PEDOT:PSS) and poly-bis (4-phenyl) (2,4,6-trimethylphenyl)amine (PTAA) were deployed as HTMs to fabricate a conventional solar cell previously. [11][12][13][14] However, because of mismatched energy band alignment and hygroscopicity, PEDOT:PSS-based PSCs always produce lower open-circuit voltage (V oc ) and poor interface contact.…”

Section: Introductionmentioning

confidence: 99%

Development of Superior Nickel Oxide Layer for Boosted Hole‐Transport Performance in Perovskite Solar Cells

Li,

Liu,

Gou

et al. 2024

Energy Tech

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Although revolutionary power conversion efficiency progress has been realized for inverted perovskite solar cells (PSCs), the selection and optimization of the hole‐transporting materials (HTMs) are still crucial for fabricating high‐efficiency, stable, and low‐cost PSCs. Nickel oxide (NiOx) is widely used in the PSCs community for material design and modification. However, various NiOx synthesis processes lead to kinds of NiOx, and it is difficult to determine which NiOx is suitable for application in PSCs. Herein, two kinds of NiOx HTMs are synthesized using sol–gel processed and chemical‐calcination‐processed (CCP) routes for the preparation of PSCs. Based on the physical properties of two kinds of NiOx HTMs as well as the corresponding photovoltaic parameters of PSCs, it is demonstrated that superior NiOx HTMs is obtained by the CCP method with the following properties: high transmittance to ensure sufficient sunlight capture of perovskite, appropriate energy levels to promote hole extraction and transfer, high conductivity to support charge transfer, and a good wetting surface to boost perovskite spreading and film formation. Thus, in this study, the direction for the reasonable selection of HTMs is pointed out to prepare efficient PSCs.

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Section: Introductionmentioning

confidence: 99%

Development of Superior Nickel Oxide Layer for Boosted Hole‐Transport Performance in Perovskite Solar Cells

Li,

Liu,

Gou

et al. 2024

Energy Tech

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“…We aim to examine the presence of such effects in MHPs by comparing Raman measurements on thin films with those of single crystals, for materials with the same nominal composition, but with distinctly different defect densities. For MHPs in particular defect densities have been reported to be of the order of ∼10 17 cm –3 for thin films and ∼10 10 cm –3 for single crystals, , therefore we contrasted ULF Raman spectra measured both for thin films and single crystals of CsPbBr 3 and MAPbI 3 in Figure (a, b). We observe that both forms of the same material exhibit very similar responses in the low-frequency region of the Raman spectra, for both compositions.…”

mentioning

confidence: 99%

Contrasting Ultra-Low Frequency Raman and Infrared Modes in Emerging Metal Halides for Photovoltaics

Lim,

Righetto,

Yan

et al. 2024

ACS Energy Lett.

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Lattice dynamics are critical to photovoltaic material performance, governing dynamic disorder, hot-carrier cooling, chargecarrier recombination, and transport. Soft metal-halide perovskites exhibit particularly intriguing dynamics, with Raman spectra exhibiting an unusually broad low-frequency response whose origin is still much debated. Here, we utilize ultra-low frequency Raman and infrared terahertz time-domain spectroscopies to provide a systematic examination of the vibrational response for a wide range of metal-halide semiconductors: FAPbI 3 , MAPbI x Br 3−x , CsPbBr 3 , PbI 2 , Cs 2 AgBiBr 6 , Cu 2 AgBiI 6 , and AgI. We rule out extrinsic defects, octahedral tilting, cation lone pairs, and "liquid-like" Boson peaks as causes of the debated central Raman peak. Instead, we propose that the central Raman response results from an interplay of the significant broadening of Raman-active, low-energy phonon modes that are strongly amplified by a population component from Bose− Einstein statistics toward low frequency. These findings elucidate the complexities of light interactions with low-energy lattice vibrations in soft metal-halide semiconductors emerging for photovoltaic applications.

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Photoconduction in 2D Single‐Crystal Hybrid Perovskites

Demontis,

Durante,

Marongiu

et al. 2024

Advanced Optical Materials

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Single‐crystal hybrid perovskites represent an emerging class of next‐generation semiconductors due to their excellent and tunable optoelectronic properties, along with a solution‐based, low‐temperature growth process. 2D single‐crystal hybrid perovskites are especially promising as their long‐range ordered multiple quantum well structure induces many peculiar properties, such as large exciton binding energy, large in‐plane conductivity, and improved environmental stability, which make them suitable for low‐dimensional optoelectronics applications and fundamental studies. Herein, the structural properties, morphology, and optoelectronic behavior of 2D thin film phenethylammonium lead iodide (PEA2PbI4) single‐crystals, synthesized using the space‐confined growth technique are explored. A planar device is fabricated and its spectral photoresponse is studied under broadband supercontinuum white light. Remarkably, the device exhibits an ultra‐low dark current (10−14 A), indicative of low defect density and suppressed ion migration. Under white light, the current increases linearly with the incident power, up to a factor of 105, and the device achieves a specific detectivity of 109 Jones. The temperature and wavelength dependence of the photocurrent suggests the dissociation of excitons as one of the main mechanisms affecting photoconduction. Furthermore, stability under air exposure and illumination turns out to be remarkable.

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Perovskite single crystals: physical properties and optoelectronic applications

Cited by 11 publications

References 181 publications

Development of Superior Nickel Oxide Layer for Boosted Hole‐Transport Performance in Perovskite Solar Cells

Development of Superior Nickel Oxide Layer for Boosted Hole‐Transport Performance in Perovskite Solar Cells

Contrasting Ultra-Low Frequency Raman and Infrared Modes in Emerging Metal Halides for Photovoltaics

Photoconduction in 2D Single‐Crystal Hybrid Perovskites

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