Modulations of various alkali metal cations on organometal halide perovskites and their influence on photovoltaic performance

Tang, Zeguo; Uchida, Satoshi; Bessho, Takeru; Kinoshita, Takumi; Wang, Haibin; Awai, Fumiyasu; Jono, Ryota; Maitani, Masato M.; Nakazaki, Jotaro; Kubo, Takaya; Segawa, Hiroshi

doi:10.1016/j.nanoen.2017.12.047

Cited by 149 publications

(117 citation statements)

References 53 publications

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“…As shown in Figure a, the cell device is composed of a multi‐layered structure of FTO/ c ‐TiO 2 / m ‐TiO 2 /Cs 1‐x R x PbBr 3 /carbon, in which the monolayer‐vertical structured perovskite grains are expected to facilitate charge transfer and suppress charge recombination. The absence of HTLs significantly reduces the production cost and simplifies fabrication processes . Figure b displays photocurrent‐voltage ( J‐V ) curves for inorganic PSCs with or without alkali metal cations doping and the corresponding photovoltaic parameters are summarized in Table .…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…[43][44][45] The Nyquist plots weremeasured under 1sun illuminationwith an applied bias voltage of 0.8 Vint he frequency range from 2MHz to 0.5 Hz. [39,47] In the presentc ase, the device without t-BAI doping exhibits as lope of 1.87 kT/q, [48,49] indicating as trong energy loss owing to trap-assisted recombination. In the plots, the low-frequency one relatest ot he recombination resistance (R rec )a tt he interface of the perovskite/charget ransport layer (CTL), the high-frequency one concerns the charge-transfer resistance( R ct )f rom perovskite to CTL, and R s is the sheet resistance of the conductive electrode.…”

Section: Resultsmentioning

confidence: 58%

“…It is well known that the slope deviation from kT/q (in which q denotes elementary charge, k is the Boltzmann constant, and T represents absolutet emperature) reflects the trap-assisted recombination. [39,47] In the presentc ase, the device without t-BAI doping exhibits as lope of 1.87 kT/q, [48,49] indicating as trong energy loss owing to trap-assisted recombination. [50,51] The device doped with t-BAI shows am uch smaller slope of 1.50 kT/q,i ndicating efficient carrier extraction,a nd thus, ah igh FF.T he reduced charge traps can be regarded as ar esult of the increased perovskite grain sizes and reduced grain boundaries.…”

Section: Resultsmentioning

confidence: 58%

Fabrication of Efficient and Stable Perovskite Solar Cells in High‐Humidity Environment through Trace‐Doping of Large‐Sized Cations

Liu

Wang

et al. 2019

ChemSusChem

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Solution‐processed organic–inorganic lead halide perovskites have shown photovoltaic performance above 23 %, attracting great attention. However, the champion devices require fabrication in a controlled inert/dry atmosphere. The development of highly efficient and stable perovskite solar cells under high‐humidity atmosphere conditions for future commercialization is still challenging, especially for CH3NH3PbI3 (MAPbI3), which is vulnerable to moisture. In this study, a large‐sized tert‐butylammonium [C(CH3)3NH3+] organic cation was incorporated into the MAPbI3 crystalline structure, which could form a more stable 3 D crystalline structure and alleviate the decomposition caused by the humidity. It delivered a power conversion efficiency of 19.3 % upon preparation under a humid environment condition of 50 % relative humidity as well as improved humidity and thermal stability. Our work provides a facile strategy for improving perovskite performance and stability by introducing a new chemical additive for the future application of perovskite solar cells.

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“…The solid‐state ionization potential value ( I p ) was measured as 5.24 eV. This value suggests that V1160 is compatible with the perovskite (valence band edge—5.6–5.8 eV) energy levels, ensuring good charge extraction.…”

Section: Methodsmentioning

confidence: 93%

Application of a Tetra‐TPD‐Type Hole‐Transporting Material Fused by a Tröger's Base Core in Perovskite Solar Cells

et al. 2019

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One of the obstacles to the commercialization of perovskite solar cells (PSCs) is the high price and morphological instability of the most common hole‐transporting material (HTM) Spiro‐OMeTAD. Herein, a novel HTM, termed V1160, based on four N,N′‐bis(3‐methylphenyl)‐N,N′‐diphenylbenzidine (TPD)‐type fragments, fused by a Tröger's base core, is synthesized and successfully applied in PSCs. Investigation of the optical, thermal, and photoelectrical properties shows that V1160 is a suitable candidate for application as an HTM in PSCs. A promising power conversion efficiency (PCE) of over 18% is demonstrated, which is only slightly lower than that of Spiro‐OMeTAD. Moreover, V1160‐based devices exhibit improved performances in dopant‐free configurations and superior stability. Favorable morphological properties in combination with a simple synthesis make V1160 and related materials promising for HTM applications.

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Modulations of various alkali metal cations on organometal halide perovskites and their influence on photovoltaic performance

Cited by 149 publications

References 53 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

Fabrication of Efficient and Stable Perovskite Solar Cells in High‐Humidity Environment through Trace‐Doping of Large‐Sized Cations

Application of a Tetra‐TPD‐Type Hole‐Transporting Material Fused by a Tröger's Base Core in Perovskite Solar Cells

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Modulations of various alkali metal cations on organometal halide perovskites and their influence on photovoltaic performance

Cited by 149 publications

References 53 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

Fabrication of Efficient and Stable Perovskite Solar Cells in High‐Humidity Environment through Trace‐Doping of Large‐Sized Cations

Application of a Tetra‐TPD‐Type Hole‐Transporting Material Fused by a Tröger's Base Core in Perovskite Solar Cells

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Product

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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