All‐Inorganic CsPbI<sub>3</sub> Quantum Dot Solar Cells with Efficiency over 16% by Defect Control

Zhang, Linlin; Kang, Cuiting; Zhang, Guizhi; Pan, Zhenxiao; Huang, Zhaoshuai; Xu, Shuaihang; Rao, Huashang; Liu, Hongbin; Wu, Shengfan; Wu, Xin; Li, Xiaosong; Zhu, Zonglong; Zhong, Xinhua; Jen, Alex K.‐Y.

doi:10.1002/adfm.202005930

Cited by 126 publications

(127 citation statements)

References 56 publications

(72 reference statements)

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“…[21] Several strategies have been reported to improve CsPbI 3 NC's stability, such as doping, small-molecule ligands, and coreshell structure. [22,23] The stability of LED is generally evaluated by T 50 , that is, the elapsed time for devices decaying to 50% of their initial electroluminescence (EL) intensity. Currently, the T 50 values of most of reported red PeLEDs are less than 10 h, which is far behind the commercialized organic LEDs with over 6 × 10 6 h. [24,25] The long-term operational stability of perovskite light-emitting diodes (PeLEDs), especially red PeLEDs with only several hours typically, has always faced great challenges.…”

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confidence: 99%

Efficient and Stable Red Perovskite Light‐Emitting Diodes with Operational Stability >300 h

et al. 2021

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The long‐term operational stability of perovskite light‐emitting diodes (PeLEDs), especially red PeLEDs with only several hours typically, has always faced great challenges. Stable β‐CsPbI3 nanocrystals (NCs) are demonstrated for highly efficient and stable red‐emitting PeLEDs through incorporation of poly(maleic anhydride‐alt‐1‐octadecene) (PMA) in synthesizing the NCs. The PMA can chemically interact with PbI2 in the precursors via the coupling effect between O groups in PMA and Pb2+ to favor crystallization of stable β‐CsPbI3 NCs. Meanwhile, the cross‐linked PMA significantly reduces the PbCs anti‐site defect on the surface of the β‐CsPbI3 NCs. Benefiting from the improved crystal phase quality, the photoluminescence quantum yield for β‐CsPbI3 NCs films remarkably increases from 34% to 89%. The corresponding red‐emitting PeLEDs achieves a high external quantum efficiency of 17.8% and superior operational stability with the lifetime, the time to half the initial electroluminescence intensity (T50) reaching 317 h at a constant current density of 30 mA cm−2.

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confidence: 99%

Efficient and Stable Red Perovskite Light‐Emitting Diodes with Operational Stability >300 h

et al. 2021

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“…Recently, Jen and coworkers used ZnI 2 as the dopant in CsPbI 3 QDs and revealed that the doping of Zn 2+ can improve the thermal stability of the device by increasing the formation energy and the Goldschmidt tolerance factor of CsPbI 3 QDs. [ 299 ] Regarding PV devices, several strategies have been reported to solve the degradation issue caused by interfaces, CTLs, and electrodes. For example, the stability of ZnO CTLs can be improved by various types of dopants, such as aluminum, magnesium, and cesium.…”

Section: Stability Of Quantum Dot Photovoltaic Devicesmentioning

confidence: 99%

Quantum Dots for Photovoltaics: A Tale of Two Materials

Duan

Guan

et al. 2021

Advanced Energy Materials

104

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solar cells (PSCs), and colloidal quantum dots (QDs) solar cells, have been quickly developed. [3][4][5][6][7][8][9][10][11] Among these diverse PV materials, QDs possess unique nanostructural uniformity and highly tunable features, including quantum confinement effects and multiple exciton generation (MEG). [12][13][14][15][16][17] QD solar cells can be fabricated as semitransparent and flexible for promising applications, such as, wearable energy collectors and building-integrated photovoltaics. [18,19] QDs are defined as nanometer-sized semiconducting crystals, usually chemically synthesized with surface ligands. [20,21] When the size of a semiconducting crystal reduces to the molecular scale, its bulk properties alter simultaneously. [22,23] Owing to the quantum confinement effect, the absorption spectra and energy levels of QDs can be easily tuned by size variation. For example, the bandgap of cadmium telluride (CdTe) bulk material is around 1.48 eV, while the bandgap of the CdTe QD can be tuned from 2.06 to 2.32 eV by a slight size reduction from 2.47 to 2.10 nm. [24,25] The quantum confinement effect also allows better energy level and absorption matching for QD-based optoelectronic devices such as photodetectors, light-emitting diodes, and solar cells. [26][27][28][29][30][31][32][33][34] Additionally, QDs enable hot cattier extraction due to the MEG effect, where one absorbed photon with high energy may generate two or more excitons. [27,35,36] The unique capability of MEG in QD solar cells can potentially improve the power conversion efficiency (PCE) of single-junction devices and thus overcome the Shockley-Queisser (SQ) PCE limit. [37][38][39] In the past decades, increasing research attention has been paid to QD solar cells, and many materials have been exploited in this context. Although there have been some trials on leadfree materials, such as Indium arsenide (InAs), InP, and AgBiS 2 , their device performances are still poor, with PCE less than 6%. [40][41][42][43][44][45] Up to now, most of the high-performance devices were reported from lead-based QDs in two main categories: lead chalcogenides (PbX, X = S, Se) and lead halide perovskites (PVK). Figure 1a depicts the progress in PCE values and accumulated publication numbers of lead-based QD solar cells, shown as points and columns, respectively, since 2010. With recent progress in device structure design, band-alignment engineering, and optimized surface passivation, the PCE of QD solar cells has constantly increased, achieving a record of 16.6% to date. [46][47][48] Before 2016, QD solar cells were mainly composed of PbX (X = S, Se), and continuous efforts have recently culminated in a remarkable PCE of 13.8%. [53][54][55] PbX usually crystallizes in a cubic structure with S or Se atoms located at octahedral Quantum dot (QD) solar cells, benefiting from unique quantum confinement effects and multiple exciton generation, have attracted great research attention in the past decades. Before 2016, research efforts were mainly devoted to solar cells ...

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“…The NC-based device was better in every aspect than the corresponding bulk solar cell; nonetheless, the performance is still far from CsPbI 3 NCs devices, that have achieved an efficiency over 16%. 41 CsSnX 3 nanocrystals (X = Cl, Br, I) CsSnX 3 rod-shaped nanocrystals (quantum rods, QRs) were synthesized using an easy, fast and clean solvothermal method. The advantage of QRs over spherical nanocrystals is that for the same diameter QRs have bigger volumes leading to a higher per-particle absorbance cross-section and, additionally, their elongated shape is supposed to improve charge injection to transport layers, which can improve device performance.…”

Section: Tin-based Perovskitesmentioning

confidence: 99%

“…5 The record for all-inorganic nanocrystal-based PSC is 16.07% obtained with Zn-doped CsPbI 3 NCs. 41 The optimization between energy levels, doping with other elements, or the introduction of stabilizing ligands/ molecules have been essential for the development of devices with greater efficiencies.…”

Section: Introductionmentioning

confidence: 99%

Earth-abundant non-toxic perovskite nanocrystals for solution processed solar cells

2021

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All‐Inorganic CsPbI₃ Quantum Dot Solar Cells with Efficiency over 16% by Defect Control

Cited by 126 publications

References 56 publications

Efficient and Stable Red Perovskite Light‐Emitting Diodes with Operational Stability >300 h

Efficient and Stable Red Perovskite Light‐Emitting Diodes with Operational Stability >300 h

Quantum Dots for Photovoltaics: A Tale of Two Materials

Earth-abundant non-toxic perovskite nanocrystals for solution processed solar cells

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All‐Inorganic CsPbI3 Quantum Dot Solar Cells with Efficiency over 16% by Defect Control

Cited by 126 publications

References 56 publications

Efficient and Stable Red Perovskite Light‐Emitting Diodes with Operational Stability >300 h

Efficient and Stable Red Perovskite Light‐Emitting Diodes with Operational Stability >300 h

Quantum Dots for Photovoltaics: A Tale of Two Materials

Earth-abundant non-toxic perovskite nanocrystals for solution processed solar cells

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Product

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All‐Inorganic CsPbI₃ Quantum Dot Solar Cells with Efficiency over 16% by Defect Control