Efficient PbS quantum dot solar cells employing a conventional structure

Lu, Kunyuan; Wang, Yongjie; Yuan, Jianyu; Cui, Zequn; Shi, Guozheng; Shi, Shaohua; Han, Lu; Chen, Si; Zhang, Yannan; Ling, Xufeng; Liu, Zeke; Chi, Lifeng; Fan, Jian; Ma, Wanli

doi:10.1039/c7ta07014d

Cited by 112 publications

(70 citation statements)

References 51 publications

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“…Furthermore, the reduced energy barrier between conduction band of TiO 2 (−4.0 eV) and that of perovskite (Figure S11, Supporting Information) as well as the valence band of perovskite and work function of carbon electrode facilitates the electron injection and hole extraction, and therefore eliminating the radiative recombination . As expected, bimolecular charge recombination behavior is reduced ( α ≈ 1, Figure b) for doped perovskite solar cells according to the following relation: J sc ∝ I α , where I represents the incident light intensity, α is a factor related to recombination.…”

Section: Resultsmentioning

confidence: 71%

Lattice Modulation of Alkali Metal Cations Doped Cs_1−xR_xPbBr₃ Halides for Inorganic Perovskite Solar Cells

et al. 2018

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The crystal structure of cesium lead halide (CsPbX3, X = I, Br, Cl) determines its charge‐carrier trap state and solar‐to‐electrical conversion ability in inorganic perovskite solar cells (PSCs). Here, the compositional engineering of inorganic CsPbBr3 perovskite by means of doping with various alkali metal cations is studied. The lattice dimensions and energy levels of Cs1‐xRxPbBr3 (R = Li, Na, K, Rb, x = 0–1) halides are optimized by tuning Cs/R ratio. Arising from promoting effects of alkali metal cations doped perovskite halides such as lattice shrink, crystallized dynamics, and electrical‐energy distribution, a maximum power conversion efficiency as high as 9.86% is achieved for hole transporting layer‐free Cs0.91Rb0.09PbBr3 tailored solar cell owing to the suppressed non‐radiative losses and radiative recombination. Furthermore, the all‐inorganic Cs0.91Rb0.09PbBr3 solar cell without encapsulation remains 97% of initial efficiency when suffering persistent attack by 80% RH in air atmosphere over 700 h, which is in comparable with state‐of‐the‐art organic–inorganic hybrid and all‐inorganic PSC devices. Employing alkali metal cations to modulate perovskite layers provide new opportunities of making high‐performance inorganic PSC platforms.

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Section: Resultsmentioning

confidence: 71%

Lattice Modulation of Alkali Metal Cations Doped Cs_1−xR_xPbBr₃ Halides for Inorganic Perovskite Solar Cells

et al. 2018

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“…When irradiating solar cells under graded‐regulated incident light intensity, the evolution of J sc and V oc can be employed to estimate the charge transport processes. By plotting J sc and V oc as a function of incident light intensity ( I ), as shown in Figure c,d, the interior recombination mechanism can be understood according to the following equations

J_{sc} \propto I^{α} (α \leq 1)

V_{oc} = n \frac{k T}{e} \ln (I) + constant

where the k is the Boltzmann constant, T is absolute temperature, e refers to elementary charge, α and n are ideal factors related to recombination. The bimolecular radiative recombination is expected to be minimal when a device is in short‐circuit condition, that is, α = 1 and the power output is maximal.…”

Section: Resultsmentioning

confidence: 99%

Simplified Perovskite Solar Cell with 4.1% Efficiency Employing Inorganic CsPbBr₃ as Light Absorber

Duan

Zhao

et al. 2018

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Perovskite solar cells with cost-effectiveness, high power conversion efficiency, and improved stability are promising solutions to the energy crisis and environmental pollution. However, a wide-bandgap inorganic-semiconductor electron-transporting layer such as TiO can harvest ultraviolet light to photodegrade perovskite halides, and the high cost of a state-of-the-art hole-transporting layer is an economic burden for commercialization. Here, the building of a simplified cesium lead bromide (CsPbBr ) perovskite solar cell with fluorine-doped tin oxide (FTO)/CsPbBr /carbon architecture by a multistep solution-processed deposition technology is demonstrated, achieving an efficiency as high as 4.1% and improved stability upon interfacial modification by graphene quantum dots and CsPbBrI quantum dots. This work provides new opportunities of building next-generation solar cells with significantly simplified processes and reduced production costs.

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“…This is in agreement with the J – V and EQE measurements in Figure . To further investigate the charge recombination kinetics in the reference and Co 3 O 4 ‐PSC, the J sc and V oc as a function of illumination intensity have been studied, as seen in Figure c and d. According to the power law equation:

J_{sc} \propto I^{α}

, where I is the light intensity and

α

is the exponential factor. As shown in Figure c, the values of

α

for Co 3 O 4 ‐PSC and reference PSC are 0.9896 and 0.9755, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure c, the values of

α

for Co 3 O 4 ‐PSC and reference PSC are 0.9896 and 0.9755, respectively. Although the exponential factor for Co 3 O 4 ‐PSC is a slightly larger than that of the reference PSC, both the values of

α

for reference and Co 3 O 4 ‐PSC are extremely close to 1, indicating the negligible bimolecular recombination in reference and Co 3 O 4 ‐PSC . In addition, the light intensity dependence of V oc can be investigated according to the following relation:

V_{oc} = n \frac{kT}{e} α \ln true(italicI true) + c

, where k is the Boltzmann constant; T is absolute temperature; e refers to the elementary charge; the α and n are ideal factors related to recombination; c is a constant .…”

Section: Resultsmentioning

confidence: 99%

Promoting the Hole Extraction with Co₃O₄ Nanomaterials for Efficient Carbon‐Based CsPbI₂Br Perovskite Solar Cells

Zhou

Zhang

et al. 2019

Solar RRL

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Carbon‐based perovskite solar cells (PSCs) have gathered much attention due to their excellent thermal stability and low cost. However, the typically used hole‐conductor‐free PSCs based on carbon electrodes show the worst performance due to the serious charge recombination at the perovskite/carbon interface. In this work, the efficient and stable carbon‐based CsPbI2Br PSCs using Co3O4 as the hole transport material (HTM) are fabricated and their photoelectric properties are systematically investigated. It is found that the Co3O4 inorganic HTM effectively promotes photo‐generated charges separation and extraction, and suppresses charge recombination at the CsPbI2Br/carbon electrode interface, resulting in the improved photovoltaic performance. At the optimal Co3O4 concentration, the carbon‐based CsPbI2Br PSCs achieve the maximum efficiency of 11.21% with a negligible J–V hysteresis. This work provides a novel strategy to fabricate efficient and stable all‐inorganic PSCs.

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Efficient PbS quantum dot solar cells employing a conventional structure

Abstract: New-generation solar cells based on colloidal lead chalcogenide (PbX) quantum dots (CQDs) are promising low-cost solution-processed photovoltaics.

Cited by 112 publications

References 51 publications

Lattice Modulation of Alkali Metal Cations Doped Cs_1−xR_xPbBr₃ Halides for Inorganic Perovskite Solar Cells

Lattice Modulation of Alkali Metal Cations Doped Cs_1−xR_xPbBr₃ Halides for Inorganic Perovskite Solar Cells

Simplified Perovskite Solar Cell with 4.1% Efficiency Employing Inorganic CsPbBr₃ as Light Absorber

Promoting the Hole Extraction with Co₃O₄ Nanomaterials for Efficient Carbon‐Based CsPbI₂Br Perovskite Solar Cells

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Efficient PbS quantum dot solar cells employing a conventional structure

Abstract: New-generation solar cells based on colloidal lead chalcogenide (PbX) quantum dots (CQDs) are promising low-cost solution-processed photovoltaics.

Cited by 112 publications

References 51 publications

Lattice Modulation of Alkali Metal Cations Doped Cs1−xRxPbBr3 Halides for Inorganic Perovskite Solar Cells

Lattice Modulation of Alkali Metal Cations Doped Cs1−xRxPbBr3 Halides for Inorganic Perovskite Solar Cells

Simplified Perovskite Solar Cell with 4.1% Efficiency Employing Inorganic CsPbBr3 as Light Absorber

Promoting the Hole Extraction with Co3O4 Nanomaterials for Efficient Carbon‐Based CsPbI2Br Perovskite Solar Cells

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Lattice Modulation of Alkali Metal Cations Doped Cs_1−xR_xPbBr₃ Halides for Inorganic Perovskite Solar Cells

Lattice Modulation of Alkali Metal Cations Doped Cs_1−xR_xPbBr₃ Halides for Inorganic Perovskite Solar Cells

Simplified Perovskite Solar Cell with 4.1% Efficiency Employing Inorganic CsPbBr₃ as Light Absorber

Promoting the Hole Extraction with Co₃O₄ Nanomaterials for Efficient Carbon‐Based CsPbI₂Br Perovskite Solar Cells