Spray Coating Technologies: Spray‐Coated Colloidal Perovskite Quantum Dot Films for Highly Efficient Solar Cells (Adv. Funct. Mater. 49/2019)

Bi, Chenghao; Wang, Shixun; Guo, Ruiqi; Shen, Ting; Zhang, Linxing; Tian, Jianjun

doi:10.1002/adfm.201970337

Cited by 26 publications

(42 citation statements)

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“…The V TFL values of CISe QD film and perovskite film are 0.68 and 0.14 V, respectively. Herein, the n trap can be expressed by the following formula [ 23–27 ]

n_{trap} = \frac{2 ε ε_{0} V_{TFL}}{e L^{2}}

here, ε is the relative dielectric constant of CISe QDs or perovskite, ε 0 is the vacuum permittivity, e is the elementary charge, and L is the thickness of the active film. The n trap of CISe QD film and perovskite film can be calculated as 4.0 × 10 16 and 2.7 × 10 16 cm −3 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Double Active Layers Constructed with Halide Perovskite and Quantum Dots for Broadband Photodetection

Guo

Bao

Gao

et al. 2020

Advanced Optical Materials

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Herein, solution‐processed, high‐performance broadband (300–1100 nm) photodetectors based on double active layers incorporating narrow‐bandgap CuInSe2 (CISe) quantum dots (QDs) and halide perovskite are devised. The CISe QDs/perovskite film as the photoactive layer boosts the photocurrent and suppresses dark current. Due to the joint light absorption effect of CISe QDs and halide perovskite, the photoelectric conversion capacity is improved. Furthermore, CISe QDs as an electron‐blocking layer can effectively block electrons to the hole transport layer and reduce the thermal noise. The optimized photodetector exhibits responsivity over 150 mA W–1 in the visible and more than 20 mA W–1 in the near‐infrared (800–1000 nm) ranges, specific detectivity of more than 7.0 × 1012 Jones in the visible region and 7.7 × 1011 Jones in the near‐infrared region, a transient response time of 277 ns with the active area of 0.013 cm2, and a linear dynamic range of ≈75 dB. Importantly, the CISe QDs layer makes the perovskite denser and more hydrophobic, thus improves the environmental and thermal stability of the detector, even extends the working temperature to exceeding 150 °C. The design concept and the considerable performance of this novel device provide a reference value for polychromatic light detection.

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“…The V TFL values of CISe QD film and perovskite film are 0.68 and 0.14 V, respectively. Herein, the n trap can be expressed by the following formula [ 23–27 ]

n_{trap} = \frac{2 ε ε_{0} V_{TFL}}{e L^{2}}

Section: Resultsmentioning

confidence: 99%

Double Active Layers Constructed with Halide Perovskite and Quantum Dots for Broadband Photodetection

Guo

Bao

Gao

et al. 2020

Advanced Optical Materials

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“…[ 28,51 ] Given that their excellent solubility in nonpolar solvents makes them compatible with various film fabrication techniques, such as spray‐coating, printing, and roll‐to‐roll processing, PNCs are promising for future, large‐scale solar cell production. [ 26,52 ]…”

Section: Unique Pnc Propertiesmentioning

confidence: 99%

“…Ligands partially substituted with short chain phenyltrimethylammonium bromide (PTABr), which contains a benzene group, not only decreased the distance between the PNCs but also passivated the defects, resulting in an enhanced carrier mobility. [ 52 ]…”

Section: Device Performancementioning

confidence: 99%

Section: Challengesmentioning

confidence: 99%

“…attempted to fabricate PNC films using spray‐coating technology (Figure 8c,d), achieving a PCE of 11.2% after a PTABr ligand exchange process. [ 52 ] The fabrication process was still a layer‐by‐layer method that required an additional ligand treatment. The critical point that made this an easier film fabrication process lies in the ligands anchored on the PNC surfaces.…”

Section: Challengesmentioning

confidence: 99%

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Metal Halide Perovskite Nanocrystal Solar Cells: Progress and Challenges

et al. 2020

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ultrasonication methods, [22] solvothermal approaches, [23] microwave-assisted synthesis, [24] and mechanical grinding. [25] PNCs not only inherit perovskite properties, but also possess the features of nanomaterials, such as their size-confinement effect and ease of processing as a colloidal ink, making PNCs suitable for incorporation into various electronic devices and compatible with printing techniques. [19,26] Moreover, nanoscale perovskites exhibit superior phase stability, particularly for CsPbI 3 and FAPbI 3 , due to their lattice construction and large surface energy. [27,28] Compared with traditional II-VI and III-V semiconductor nanocrystals, PNCs also exhibit unique properties. [29-32] Firstly, facile synthesis with inexpensive precursors can be conducted at room temperature with PNCs without inert gas protection. PNCs also have a bandgap ranging from the ultraviolet to nearinfrared, through which they can be easily tuned by size management and composition adjustment. Furthermore, they exhibit narrow bandwidth emission (<100 meV) over the entire visible range. PNCs also exhibit a fluorescence quantum yield near unity without additional passivation due to the defect-tolerance effect. Finally, they also demonstrate negligible self-absorption and Förster resonance energy transfer. These remarkable characteristics make PNCs more favorable than their bulk counterparts and traditional semiconductor nanocrystals. Thus, PNCs have promising applications in light-emitting diodes (LEDs), [33] lasers, [34] photodetectors, [35,36] and solar cells. [28] In 2016, Luther et al. first used CsPbI 3 PNCs to fabricate solar cells using a layer-by-layer approach. [28] The solar cell exhibited an extremely high open-circuit voltage (V OC) of 1.23 V, which was ≈85% of the Shockley-Queisser (S-Q) limited V OC , and a high power conversion efficiency (PCE) of 10.77%. This value was comparable to those of state-of-the-art PbS nanocrystal solar cells, [37] indicating the potential of PNC solar cells. To date, the highest PCE achieved by PNC solar cells has reached 17.39%. [38] Though PCEs have shown rapid, significant improvements, they are still limited compared to solar cells fabricated by bulk perovskite materials. Moreover, most studies on PNC solar cells have only been reported over the past two years. Research on PNC solar cells is still in its infancy, leaving substantial room for further improvement. Herein, we review the progress in the field of PNC solar cells. This review starts with detailing the unique advantages of PNCs. Next, we analyze current factors limiting their performance and Perovskite nanocrystal (PNC) solar cells have attracted increasing interest in recent years because of their excellent optoelectronic properties and unique advantages, which distinguish them from conventional nanocrystals and their bulk counterparts. This emerging type of photovoltaic is promising but faces many challenges regarding commercialization. Therefore, a comprehensive review is presented on the recent progress and current ch...

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High Efficiency Inorganic Perovskite Solar Cells Based On Low Trap Density and High Carrier Mobility CsPbI₃ Films

Zhang

Deng

et al. 2022

Adv Funct Materials

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Inorganic perovskite CsPbI3 has exhibited promising performance in single‐junction solar cells, but the grain boundaries (GBs) in its film cause the formation of the defects with deep energy levels (such as iodide vacancy (VI)) and impede the transport of carriers, worsening the efficiency and stability of the solar cells. Here, a CsPbI3 precursor is devised with thiophenol series ligands (TP‐ligands) containing both SH and π‐conjugated molecules. The strong interaction between the SH group (Lewis base) and PbI2 (Lewis acid) suppresses the formation of PbI42− in perovskite solution, thus suppressing the formation of VI in the film accordingly. The terminal groups, such as ‐F and ‐NH2, are employed to achieve an appropriate evaporation speed of the ligands and prevent the oxidation of the thiophenol group, then a high‐quality perovskite film with low trap density is obtained. In addition, the functional group π‐conjugated molecules provide additional carrier transmission channels at the GBs to increase carrier mobility, which facilitates the exciton separation and prolongs the charge lifetime. The CsPbI3 solar cell shows a considerable power conversion efficiency of 20.1% with an open‐current voltage of 1.18 V and a high fill factor of 83.5% and excellent working stability.

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Spray Coating Technologies: Spray‐Coated Colloidal Perovskite Quantum Dot Films for Highly Efficient Solar Cells (Adv. Funct. Mater. 49/2019)

Cited by 26 publications

References 0 publications

Double Active Layers Constructed with Halide Perovskite and Quantum Dots for Broadband Photodetection

Double Active Layers Constructed with Halide Perovskite and Quantum Dots for Broadband Photodetection

Metal Halide Perovskite Nanocrystal Solar Cells: Progress and Challenges

High Efficiency Inorganic Perovskite Solar Cells Based On Low Trap Density and High Carrier Mobility CsPbI₃ Films

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Spray Coating Technologies: Spray‐Coated Colloidal Perovskite Quantum Dot Films for Highly Efficient Solar Cells (Adv. Funct. Mater. 49/2019)

Cited by 26 publications

References 0 publications

Double Active Layers Constructed with Halide Perovskite and Quantum Dots for Broadband Photodetection

Double Active Layers Constructed with Halide Perovskite and Quantum Dots for Broadband Photodetection

Metal Halide Perovskite Nanocrystal Solar Cells: Progress and Challenges

High Efficiency Inorganic Perovskite Solar Cells Based On Low Trap Density and High Carrier Mobility CsPbI3 Films

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High Efficiency Inorganic Perovskite Solar Cells Based On Low Trap Density and High Carrier Mobility CsPbI₃ Films