Interstitial Mn<sup>2+</sup>-Driven High-Aspect-Ratio Grain Growth for Low-Trap-Density Microcrystalline Films for Record Efficiency CsPbI<sub>2</sub>Br Solar Cells

Bai, Dongliang; Zhang, Jingru; Jin, Zhiwen; Bian, Hui; Wang, Kang; Wang, Haoran; Liu, Liang; Wang, Qian; Liu, Shengzhong

doi:10.1021/acsenergylett.8b00270

Cited by 372 publications

(317 citation statements)

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“…As typical defect‐tolerant materials, doping is an effective strategy to produce perovskites with high PL efficiencies and stability, and suitable electrical properties . Hence, the stability and PLQY are obviously enhanced by reducing the defect state density and passivating grain boundaries, leading to excellent optoelectronic properties for devices constructed by using the doped perovskites as active layers . Typically, various metal ions, including Bi 3+ , Ni 2+ , Mn 2+ , Cu 2+ , Zn 2+ , Cd 2+ and rare earth ions (eg, Ce 3+ , Er 3+ , Yb 3+ ), have been doped into halide perovskites.…”

Section: Component Engineering For Blue‐emissive Perovskitesmentioning

confidence: 99%

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Fang

Zhang

Yuan

et al. 2019

InfoMat

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Perovskite based light‐emitting diodes (PeLEDs) have become a powerful candidate for next‐generation solid‐state lightings and high‐definition displays due to their high photoluminescence quantum yield (PLQY), tunable emission wavelength over the visible spectrum, and narrow emission linewidths. Over the past few years, the development of red‐ and green‐emissive PeLEDs has rapidly increased, and the corresponding external quantum efficiencies (EQE) have exceeded 20%. However, the research progress of blue‐emitting PeLEDs is limited by its poor material quality and inappropriate device structure. Currently, the maximum EQE of blue PeLED is only 6.2%, which is far from the industrialization requirements. In order to promote the development of blue PeLEDs, we summarize the recent research progress of blue perovskite materials and LEDs and discuss several fatal challenges, mainly embodied in low efficiency and poor stability. In order to overcome these challenges, detailed analysis and strategies are put forward in terms of the materials and devices. For the former, we summarize the feasible strategy for the preparation of efficient and stable blue‐emissive perovskites using component engineering. For the latter, we analyze the advantages and limitations of the different strategies for blue‐emissive perovskite in LEDs. At the end of the review, a comprehensive outlook is detailed, including future development directions and several technical problems to be solved. Thus, we aim to highlight the significance and promote the industrialization of PeLEDs.

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Section: Component Engineering For Blue‐emissive Perovskitesmentioning

confidence: 99%

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Fang

Zhang

Yuan

et al. 2019

InfoMat

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“…Till now, enormous efforts have proved that reducing iodide dosage of perovskite film can significantly improve the durability and photovoltaic performance. For example, the PCE of perovskite CsPbI 2 Br based device have been over 13% by optimizing the crystal construction . Unfortunately, the stability of iodinated perovskite is still unsatisfactory in relatively high humidity condition.…”

Section: Introductionmentioning

confidence: 99%

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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“…[17] Meanwhile, the past decade has witnessed unprecedented success of organicinorganic hybrid perovskites in PV applications, with the reported PCE of perovskite solar cells exceeding 23%. [29][30][31][32][33][34][35][36][37][38] Among these all-inorganic perovskite materials, α-CsPbI 3 exhibits an ideal optical bandgap (E g ) of 1.73 eV for PV applications. [29][30][31][32][33][34][35][36][37][38] Among these all-inorganic perovskite materials, α-CsPbI 3 exhibits an ideal optical bandgap (E g ) of 1.73 eV for PV applications.…”

mentioning

confidence: 99%

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Ling

Zhou

Yuan

et al. 2019

Advanced Energy Materials

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During the past decade, inorganic CQDs, namely the lead chalcogenides (e.g., PbS), have attracted tremendous attention in solution-processed solar cells. Due to the great efforts on CQDs synthesis modification, [7][8][9] surface passivation, [10][11][12] and device fabrication optimization, [13][14][15][16] PbS QD solar cells continue to progress at an extraordinary rate, improving overall efficiencies by ≈1% per year and currently have a certified power conversion efficiency (PCE) exceeding 12%. [17] Meanwhile, the past decade has witnessed unprecedented success of organicinorganic hybrid perovskites in PV applications, with the reported PCE of perovskite solar cells exceeding 23%. [18][19][20][21][22][23][24][25][26][27][28] However, the challenging stability issues of these hybrid perovskites further motivate the research of all-inorganic perovskites (CsPbX 3 , X = Cl − , Br − , I − or mixed halides) without any volatile organic components. [29][30][31][32][33][34][35][36][37][38] Among these all-inorganic perovskite materials, α-CsPbI 3 exhibits an ideal optical bandgap (E g ) of 1.73 eV for PV applications. However, the nonphotoactive orthorhombic phase (E g = 2.82 eV) is more thermodynamically preferred at low temperature. [29] Therefore, the perovskite phase of CsPbI 3 usually requires complex annealing processes at high temperature to achieve satisfactory film quality. As mentioned above, QD technology offers colloidal synthesis of conventional bulk materials, which Surface manipulation of quantum dots (QDs) has been extensively reported to be crucial to their performance when applied into optoelectronic devices, especially for photovoltaic devices. In this work, an efficient surface passivation method for emerging CsPbI 3 perovskite QDs using a variety of inorganic cesium salts (cesium acetate (CsAc), cesium idodide (CsI), cesium carbonate (Cs 2 CO 3 ), and cesium nitrate (CsNO 3 )) is reported. The Cs-salts post-treatment can not only fill the vacancy at the CsPbI 3 perovskite surface but also improve electron coupling between CsPbI 3 QDs. As a result, the free carrier lifetime, diffusion length, and mobility of QD film are simultaneously improved, which are beneficial for fabricating high-quality conductive QD films for efficient solar cell devices. After optimizing the post-treatment process, the short-circuit current density and fill factor are significantly enhanced, delivering an impressive efficiency of 14.10% for CsPbI 3 QD solar cells. In addition, the Cs-salt-treated CsPbI 3 QD devices exhibit improved stability against moisture due to the improved surface environment of these QDs. These findings will provide insight into the design of high-performance and low-trap-states perovskite QD films with desirable optoelectronic properties. Perovskite Quantum DotsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.Solution-processed colloidal quantum dots (CQDs) are promising candidates for the next generation photovoltaics (PVs) due to the excellent tuna...

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Interstitial Mn²⁺-Driven High-Aspect-Ratio Grain Growth for Low-Trap-Density Microcrystalline Films for Record Efficiency CsPbI₂Br Solar Cells

Cited by 372 publications

References 63 publications

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

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

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

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Interstitial Mn2+-Driven High-Aspect-Ratio Grain Growth for Low-Trap-Density Microcrystalline Films for Record Efficiency CsPbI2Br Solar Cells

Cited by 372 publications

References 63 publications

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

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

14.1% CsPbI3 Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

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Interstitial Mn²⁺-Driven High-Aspect-Ratio Grain Growth for Low-Trap-Density Microcrystalline Films for Record Efficiency CsPbI₂Br Solar Cells

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

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation