A Universal Method of Perovskite Surface Passivation for CsPbX3 Solar Cells with VOC over 90% of the S‐Q limit

Guo, Zhanglin; Zhao, Shuai; Shibayama, Naoyuki; Jena, Ajay Kumar; Takei, Izuru; Miyasaka, Tsutomu

doi:10.1002/adfm.202207554

Cited by 47 publications

(45 citation statements)

References 49 publications

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“…Metal halide perovskite nanocrystals (MHPNCs) of generalized formula ABX 3 (A = Cs, Rb, CH 3 NH 3 , and CH(NH 2 ) 2 ; B = Pb, Sn, and Ge; X = Cl, Cl/Br, Br, Br/I, and I) have emerged as a new class of semiconducting materials owing to their solution processability for cost-effective synthesis and outstanding photophysical properties, such as tunable bandgaps, narrow-band emissions, structure dimensionality (0D to 3D), defect tolerance, low trap densities, long charge carrier mobilities, long minority carrier diffusion lengths, and near-unity photoluminescence quantum yields (PLQYs). − Due to these excellent optical and transport properties, metal-halide perovskites have been extensively used in constructing photovoltaic materials, such as low-threshold lasers, high-efficiency solar cells, light-emitting diodes (LEDs) and anticounterfeiting, , and ultrafast photodetectors . To date, the most commonly adopted approaches for synthesizing PNCs are hot-injection (H-I), , sonochemical, , anion-exchange methods, , solvothermal, , room temperature-based ligand-assisted reprecipitation (LARP), , and supersaturated recrystallization (SR), , in which particle shape and size are tuned by controlling the precursor composition, temperature, and reaction time.…”

Section: Introductionmentioning

confidence: 99%

Polar-Solvent-Free Sonochemical Synthesis of Mn(II)-Doped CsPbCl₃ Perovskite Nanocrystals for Dual-Color Emission

Naresh

Cho

Cha

et al. 2023

ACS Appl. Nano Mater.

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We present a facile, one-step, polar-solvent-free sonochemical synthesis of a series of Mn-doped CsPbCl 3 perovskite nanocrystals (PNCs) by varying the Pb-to-Mn ratio, after which their structure, morphology, and temperature-dependent photoluminescence (PL) properties are investigated. The partial substitution of Pb 2+ with Mn 2+ in CsPbCl 3 PNCs caused lattice contraction without affecting the morphology and structure. All Mn-doped PNCs exhibited dual-wavelength PL profiles, with a weak violet band at around 410 nm attributed to band-edge exciton and a strong orange band at around 596 nm attributed to Mn 2+ : 4 T 1 → 6 A 1 transition, benefited by the exciton-to-Mn 2+ energy transfer. Furthermore, Mn doping increased the PL quantum yield (PLQY) from 5.1% in CsPbCl 3 to 41.14% for 11.8% Mn-doped PNCs as well as decay lifetimes from nanoseconds to milliseconds (long-lived emissive states). Owing to the thermally assisted transition from the exciton to 4 T 1 energy level of Mn 2+ , the temperature-dependent steady-state PL and timeresolved PL spectra of exciton and Mn 2+ in Mn-doped CsPbCl 3 PNCs displayed unusual and contradictory trends. The ultrasonication synthesized Mn-doped PNCs exhibited superior long-term stability, retaining 62% (@ RH 75%) of the initial PL without requiring additional encapsulation. To evaluate the suitable application of Mn-doped CsPbCl 3 PNCs in the white lightemitting diode (w-LED) as a display system, we built a prototype w-LED using blue-, green-, and orange-emitting CsPb(Cl 0.5 / Br 0.5 ) 3 , CsPbBr 3 , and Mn-doped CsPbCl 3 -coated glass slices onto a 20 mA UV LED chip. The constructed prototype w-LED generated bright white light, achieving a luminous efficiency of 76.3 lm/W, color rendering index of 81.4, R9 of 80.1, and a wide color gamut of 101.78% NTSC and 76% BT-2020, demonstrating its promising application in w-LEDs.

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Section: Introductionmentioning

confidence: 99%

Polar-Solvent-Free Sonochemical Synthesis of Mn(II)-Doped CsPbCl₃ Perovskite Nanocrystals for Dual-Color Emission

Naresh

Cho

Cha

et al. 2023

ACS Appl. Nano Mater.

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“…According to previous research, the XPS peak of the Pb signal at ∼136.5 eV can be recognized as metallic Pb 0 or Cs 4 PbBr 6 . 17,24–27 X-ray diffraction (XRD) measurements were performed to obtain structural information of the PEA + -doped MHP film before and after electron radiation (Fig. S2†).…”

Section: Resultsmentioning

confidence: 99%

“…As is widely recognized, metallic Pb 0 is detrimental for carrier transfer and tends to induce severe non-irradiative recombination. 24,27 The reduction of Pb 2+ has been reported in MAPbI 3 perovskite for solar cells as a redox process triggered by illumination or heat, where MA + refers to a methylamine cation. 27 The photogenerated excitons in MAPbI 3 are separated into electrons and holes, resulting in Pb 2+ reduction and I − oxidation, respectively.…”

Section: Resultsmentioning

confidence: 99%

Unveiling the degraded electron durability in reduced-dimensional perovskites

Shen

et al. 2023

Nanoscale

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“…[ 30–32 ] Thiophene‐based derivatives are one of the effective phase stabilizer and defect passivator. [ 33–39 ] Snaith's group employed thiophene as a Lewis base to passivate Pb‐related defects on perovskite surface. [ 33 ] However, its passivation ability is worse than pyridine and other nitrogen‐contained Lewis bases due to the lower activity of lone‐pair electrons from sulfur atoms.…”

Section: Introductionmentioning

confidence: 99%

21.15%‐Efficiency and Stable γ ‐CsPbI₃ Perovskite Solar Cells Enabled by an Acyloin Ligand

et al. 2023

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with silicon or other low-bandgap perovskite solar cells (PSCs). [1][2][3][4] Encouragingly, the reported power conversion efficiency (PCE) of CsPbI 3 PSCs has rocketed up from 2.9% [5] in 2015 to 21.0% [6,7] at present, which provides a strong potential to put it into practical application. [8][9][10][11][12][13] However, the CsPbI 3 perovskite presents various phases (α, β, γ), and is easy to convert into yellow-phase (δ) at room-temperature, resulting in a great number of defects, such as vacancy/interstitial/antisite defects. [9,14] To obtain a stable photoactive CsPbI 3 perovskite, controlling the crystallization process and reducing the distortion of loosening [PbI 6 ] 4− octahedra are vital importance by employing device-fabricating engineering or various organic matrix additives. [15][16][17] Unold's group fabricated stable γ -CsPbI 3 films by co-evaporating CsI and PbI 2 precursor on substrate with a temperature as low as 50 °C. [18] Kemell's group employed atomic layer deposition (ALD) method to fabricate the stable γ -CsPbI 3 film through controlling the deposition temperature and cycles. [19] Song's group obtained stable γ-CsPbI 3 films by vacuum-assisted thermal annealing method. [20] Compared with high requirements toward expensive equipment and tedious process of the device fabricating engineering, incorporating the multifunctional organic matrix into CsPbI 3 perovskite could not only obtain the stable γ-CsPbI 3 but also modify CsPbI 3 films for constructing low-dimensional perovskite, [6,21,22] tuning the band structure of perovskite [23] and passivating the defects. [24,25] Pang's group developed an additive-involved leaching method to prepare high crystalline γ -CsPbI 3 film by a solution-assisted reaction between DMAPbI 3 and Cs 4 PbI 6 at 100 °C. [26] Luo's group fabricated the pure-phase and high-quality γ -CsPbI 3 with assistance of formamidine acetate (FAAc). [27] Recently, our group obtained the stable γ-CsPbI 3 by adding 3% hydrazide derivatives into precursor solution to increase the defects formation energy. [25] Small heterocyclic molecules are effective additives to stabilize perovskite phase and passivate Pb-related defects due to their strong interaction with perovskite, [28,29] leading to favorable phase preparation and less [PbI 6 ] 4− structural distortion, which are beneficial for improving the device efficiency, the long-term stability, and the large-scale fabrication. [30][31][32] Thiophene-based Cesium lead triiodide (CsPbI 3 ) is a promising light-absorbing material for constructing perovskite solar cells (PSCs) owing to its favorable bandgap and thermal tolerance. However, the high density of defects in the CsPbI 3 film not only act as recombination centers, but also facilitate ion migration, leading to lower PCE and inferior stability compared with the state-of-the-art organic-inorganic hybrid PSC counterpart. Theoretical analyses suggest that the effective suppression of defects in CsPbI 3 film is helpful for improving the device performance. Herein, the stable and effici...

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A Universal Method of Perovskite Surface Passivation for CsPbX₃ Solar Cells with V_OC over 90% of the S‐Q limit

Cited by 47 publications

References 49 publications

Polar-Solvent-Free Sonochemical Synthesis of Mn(II)-Doped CsPbCl₃ Perovskite Nanocrystals for Dual-Color Emission

Polar-Solvent-Free Sonochemical Synthesis of Mn(II)-Doped CsPbCl₃ Perovskite Nanocrystals for Dual-Color Emission

Unveiling the degraded electron durability in reduced-dimensional perovskites

21.15%‐Efficiency and Stable γ ‐CsPbI₃ Perovskite Solar Cells Enabled by an Acyloin Ligand

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A Universal Method of Perovskite Surface Passivation for CsPbX3 Solar Cells with VOC over 90% of the S‐Q limit

Cited by 47 publications

References 49 publications

Polar-Solvent-Free Sonochemical Synthesis of Mn(II)-Doped CsPbCl3 Perovskite Nanocrystals for Dual-Color Emission

Polar-Solvent-Free Sonochemical Synthesis of Mn(II)-Doped CsPbCl3 Perovskite Nanocrystals for Dual-Color Emission

Unveiling the degraded electron durability in reduced-dimensional perovskites

21.15%‐Efficiency and Stable γ ‐CsPbI3 Perovskite Solar Cells Enabled by an Acyloin Ligand

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A Universal Method of Perovskite Surface Passivation for CsPbX₃ Solar Cells with V_OC over 90% of the S‐Q limit

Polar-Solvent-Free Sonochemical Synthesis of Mn(II)-Doped CsPbCl₃ Perovskite Nanocrystals for Dual-Color Emission

Polar-Solvent-Free Sonochemical Synthesis of Mn(II)-Doped CsPbCl₃ Perovskite Nanocrystals for Dual-Color Emission

21.15%‐Efficiency and Stable γ ‐CsPbI₃ Perovskite Solar Cells Enabled by an Acyloin Ligand