Retina‐Inspired Artificial Synapses with Ultraviolet to Near‐Infrared Broadband Responses for Energy‐Efficient Neuromorphic Visual Systems (Adv. Funct. Mater. 32/2023)

Zhang, Junyao; Guo, Pu; Guo, Zhang; Li, Li; Sun, Tongrui; Liu, Dapeng; Li, Tian; Zu, Guoqing; Xiong, Lize; Zhang, Jianhua; Huang, Jia

doi:10.1002/adfm.202370197

Cited by 14 publications

(16 citation statements)

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“…Compared with SnO 2 /CsPbIBr 2 , the SnO 2 –MXene/CsPbIBr 2 sample obtained a lower PL strength, indicating that the addition of MXene successfully enhanced the electron extraction from perovskite to ETL and inhibited carrier recombination. [ 22,32 ] Figure 2h shows the time‐resolved PL (TRPL) test result, and Table S1, Supporting Information summarizes the relevant parameters fitted by the double exponential equation. The life of SnO 2 –MXene/CsPbIBr 2 is much shorter than the SnO 2 /CsPbIBr 2 , indicating that the charge extraction of SnO 2 /MXene ETL is better than SnO 2 ETL, which is consistent with the steady‐state PL results.…”

Section: Resultsmentioning

confidence: 99%

“…[ 13 ] Zhang et al introduced hydrazine (N 2 H 4 )‐treated 2D Nb 2 CT x MXene nanosheets as the ETL layer and introduced them into the perovskite precursor, which promoted the formation of high‐quality perovskite films. [ 22 ] Wang et al added Ti 3 C 2 T x MXene nanosheets to the perovskite precursor to enhance the separation and transfer of photogenic electrons. [ 23 ]…”

Section: Introductionmentioning

confidence: 99%

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High‐Performance Carbon‐Based CsPbIBr₂ Solar Cells by SnO₂–MXene‐Regulating Perovskite Vertical Growth

Wang

et al. 2023

Solar RRL

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Due to its unique photoelectric properties, MXene has a wide range of potential applications. Herein, different MXene contents (0, 0.10, 0.15, 0.20, 0.25, 0.4 wt%) of SnO2–MXene nanocomposites are used as the electron transport layer. The introduction of MXene not only inhibits SnO2 agglomeration and induces the vertical growth of CsPbIBr2, but also passivates defects of the SnO2/CsPbIBr2 interface. It effectively increases the power conversion efficiency from 8.98% to 11.21%. In addition, even after 1000 h of storage with a relative humidity of more than 50% in the ambient air, the unsealed device still maintains about 92% of its initial efficiency. This strategy provides a promising way to improve the efficiency of solar cells.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐Performance Carbon‐Based CsPbIBr₂ Solar Cells by SnO₂–MXene‐Regulating Perovskite Vertical Growth

Wang

et al. 2023

Solar RRL

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“…[ 15 ] Due to the strong interaction between the external molecule and the perovskite colloids in the intermediate phase, the colloid attachment can be slowed down, leaving enough time for its relaxation to the equilibrium position in the solid. [ 16–19 ] Therefore, additives that interact with perovskite colloids to form an intermediate phase can delay the crystallization. [ 20–23 ] However, the optimized perovskite crystallization kinetics during annealing remains unknown because it is rather tough to in situ observe crystallization kinetics during annealing.…”

Section: Introductionmentioning

confidence: 99%

Understanding Microstructural Development of Perovskite Crystallization for High Performance Solar Cells

Ma,

Du,

Chen

et al. 2023

Advanced Materials

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Solution crystallization in film devices has attracted broad interest from various fields such as perovskite solar cells. However, the detailed perovskite crystallization kinetics remain unclear due to the difficulty of in situ observation of grain cluster growth during annealing. This article presents the development of an in situ laser scanning confocal polarized microscopy with a temperature‐controlled stage to observe nucleation and growth of perovskite crystal clusters. It is found that enhanced interactions by a liquid crystal with perovskite form a new intermediate complex that induces diffusion‐controlled growth according to Avrami equation. The retarded cluster growth (63 nm s−1) originates from enlarged diffusion activation energy 40 kJ mol−1 compared with 152 nm s−1 and 37 kJ mol−1 for the Control film during annealing. Finally, the optimized perovskite films with enhanced crystallographic and optical characteristics are applied in solar cells to achieve a champion efficiency of 24.53% with open circuit voltage of 1.172 V and fill factor of 82.78%. The bare device without any protection maintains 89% of its initial efficiency after 6600 h of aging in ambient environment. This work implies that the in situ observation using fluorescence microscopy is a critical for understanding of crystallization kinetics in film devices.

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“…[ 3–6 ] A passivation effect with the residual PbI 2 existing in the grain boundaries has also been found. [ 6–8 ] As excess PbI 2 suppresses nonradiative charge carrierrecombination and enhances the charge carrier lifetime, it can promote the corresponding device performance. [ 9–11 ] Since PbI 2 has the advantage of a defect passivation effect, modulating the distribution and size of the PbI 2 residues can preserve the positive effect.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Stability of Efficient Perovskite Solar Cells (PCE ≈ 24.5%) by Suppressing PbI₂ Inclusion Formation

Shin

Nandi

Seo

et al. 2023

Adv Funct Materials

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Excess lead(II) iodide (PbI2) has controversial roles in affecting the efficiency of perovskite solar cells (PSCs). Since the photoinstability of PbI2 is now known to largely accelerate perovskite degradation, suppressing and/or eliminating excess PbI2 is key to improving the stability of PSCs. Herein, process‐dependent PbI2 formation on the surfaces of formamidinium lead triiodide (FAPbI3) films is examined. Due to the faster evaporation rate of organic substances, crystalline PbI2 as an inclusion is found within the triple junction grain boundaries. With this hypothesis, two strategies are suggested: control of the 1) vapor pressure and 2) stoichiometry of precursor solutions to induce sufficient reaction of FAPbI3. Although both strategies successfully eliminate the PbI2 as inclusions, due to the slower evaporation rate, vapor pressure control films also exhibit a larger grain size (≈1.18 µm) with a good film quality to attain the highest power conversion efficiency (PCE) of 24.5%. Furthermore, the phase stability of α‐FAPbI3 is improved due to the elimination of the degradation sites induced by the photoinstability of PbI2. The findings explore the formation process of unwanted PbI2 (≈2.8%) and provide a simple method to effectively suppress its formation. This may further boost the PCE and stability, especially for FA‐based perovskites.

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Retina‐Inspired Artificial Synapses with Ultraviolet to Near‐Infrared Broadband Responses for Energy‐Efficient Neuromorphic Visual Systems (Adv. Funct. Mater. 32/2023)

Cited by 14 publications

References 0 publications

High‐Performance Carbon‐Based CsPbIBr₂ Solar Cells by SnO₂–MXene‐Regulating Perovskite Vertical Growth

High‐Performance Carbon‐Based CsPbIBr₂ Solar Cells by SnO₂–MXene‐Regulating Perovskite Vertical Growth

Understanding Microstructural Development of Perovskite Crystallization for High Performance Solar Cells

Enhancing Stability of Efficient Perovskite Solar Cells (PCE ≈ 24.5%) by Suppressing PbI₂ Inclusion Formation

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Retina‐Inspired Artificial Synapses with Ultraviolet to Near‐Infrared Broadband Responses for Energy‐Efficient Neuromorphic Visual Systems (Adv. Funct. Mater. 32/2023)

Cited by 14 publications

References 0 publications

High‐Performance Carbon‐Based CsPbIBr2 Solar Cells by SnO2–MXene‐Regulating Perovskite Vertical Growth

High‐Performance Carbon‐Based CsPbIBr2 Solar Cells by SnO2–MXene‐Regulating Perovskite Vertical Growth

Understanding Microstructural Development of Perovskite Crystallization for High Performance Solar Cells

Enhancing Stability of Efficient Perovskite Solar Cells (PCE ≈ 24.5%) by Suppressing PbI2 Inclusion Formation

Contact Info

Product

Resources

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High‐Performance Carbon‐Based CsPbIBr₂ Solar Cells by SnO₂–MXene‐Regulating Perovskite Vertical Growth

High‐Performance Carbon‐Based CsPbIBr₂ Solar Cells by SnO₂–MXene‐Regulating Perovskite Vertical Growth

Enhancing Stability of Efficient Perovskite Solar Cells (PCE ≈ 24.5%) by Suppressing PbI₂ Inclusion Formation