Novel Cobalt Complexes as a Dopant for Hole-transporting Material in Perovskite Solar Cells

Onozawa-Komatsuzaki, Nobuko; Funaki, Takashi; Murakami, Takurou N.; Kazaoui, Saïd; Chikamatsu, Masayuki; Sayama, Kazuhiro

doi:10.5796/electrochemistry.85.226

Cited by 12 publications

(6 citation statements)

References 23 publications

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“…Traditionally, the hole transporting layer of PSCs is heavily doped with p-type dopants to provide the necessary electrical conductivity for the state-of-the-art spiro-OMeTAD and other wide bandgap HTMs. Numerous p-type dopants have been developed and realized including 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4TCNQ),73–75 benzoyl peroxide,76 and copper( ii )77 and cobalt( iii )78,79 complexes (Fig. 5).…”

Section: Introductionmentioning

confidence: 99%

Efficiencyvs.stability: dopant-free hole transporting materials towards stabilized perovskite solar cells

2019

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Section: Introductionmentioning

confidence: 99%

Efficiencyvs.stability: dopant-free hole transporting materials towards stabilized perovskite solar cells

2019

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“…Thus far, many molecular chemical dopants such as AgTFSI, N(PhBr) 3 SbCl 6 , SnCl 4 , a few Co(III) complexes (FK 209, FK 102, MY 11, etc. ), − 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ), , spiro(TFSI) 2 , an iridium–pyridine–pyrozolyl complex, and molybdenum tris(dithiolene)s are reported as direct p-dopants for the spiro-OMeTAD HTL and used in dye-sensitized and, to a lesser extent, perovskite solar cells. In particular, Cu(I) salts (CuSCN and CuI) and Cu(II) pyridine complexes are employed as direct p-dopants for spiro-OMeTAD HTL in a solution process and applied in mixed halide perovskite solar cells.…”

Section: Introductionmentioning

confidence: 99%

Li-Salt-Free, Coevaporated Cu(TFSI)₂-Doped Hole Conductors for Efficient CH₃NH₃PbI₃ Perovskite Solar Cells

Mohanraj

Stihl

Simon

et al. 2019

ACS Appl. Energy Mater.

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In n–i–p-type conventional perovskite solar cells (PSCs) using a doped 2,2′,7,7′-tetrakis (N,N′-di-p-methoxyphenylamine)-9,9′-spirofluorene (spiro-OMeTAD) hole transport layer (HTL), the issues of reproducibility and stability are closely associated with the redox-inactive additives lithium bis(trifluoromethanesulfonyl)imide (Li-TFSI) and 4-tert-butylpyridine (tBP). Instead of these additives, copper(II) di[bis(trifluoromethylsulfonyl)imide] (Cu(TFSI)2) is demonstrated as a direct and efficient p-dopant for spiro-OMeTAD. With the adoption of the technologically relevant coevaporation technique, highly uniform, pinhole-free doped HTLs are achieved with controlled amounts of Cu(TFSI)2 and are spectroscopically and electrically characterized. Using these highly conducting doped HTLs, CH3NH3PbI3-based planar PSCs are realized, which exhibit high photoconversion efficiency (>13% with merely 4 mol % dopant) and excellent reproducibility. Also, by taking advantage of the coevaporation technique, the Cu(TFSI)2-doped HTL thickness impact on PSCs is investigated. It is observed that devices with even the thinnest (40 nm) HTL perform very similarly to the ones with a 100 nm thick HTL, which opens up cost-effective preparation strategies. Moreover, a remarkable storage stability over 218 days is observed for devices with a coevaporated Cu(TFSI)2-doped HTL, suggesting that this approach of controlled direct doping is a viable alternative to the existing arbitrarily p-doped HTL in perovskite solar cells.

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“…This quantity relates closely to the absorption profile gradient of the RTP emitter (Section S6, Supporting Information). For such scenarios, it is feasible to employ phosphors with steep absorption edges, e.g., 2,2′,7,7′-tetrakis(diphenylamino)-9,9′-spirobifluorene (Spiro-TAD), [38] 2,2′,7,7′-tetra(N,N-di-p-tolyl)amino-9,9-spirobifluorene (Spiro-TTB), [39] or 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (Spiro-OMe-TAD), [40] which are established, temperature-stable organic light-emitting diode (OLED) materials. [41][42][43] Also the optimized emitter concentration can change the required exciton dynamics, as scanned in ref.…”

Section: Discussion and Perspectivesmentioning

confidence: 99%

Accurate Wavelength Tracking by Exciton Spin Mixing

et al. 2022

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for various fields of application, such as chemical material analysis, characterization of light sources, or calibration of monochromators and laser sources. Established techniques for realizing wavelength-selective light detection use one of two primary approaches: first, wavelength separation by an auxiliary structure, [1] i.e., a filter array or grating, where narrow light bands are directed onto individual pixels of a photodetector (PD) (array) with a broadband response; second, wavelength separation by the photoactive part itself, achieved by a multilayer arrangement of detectors, where every single detector is sensitive to a specific wavelength band. [2,3] Such spectroscopic devices commonly comprise solid hardware components that restrict them from versatile integration.Recent developments, however, demonstrate both the huge drive and great potential in terms of easy-to-integrate, low-cost, or lightweight applications, [4] e.g., narrowband photodiodes, [5][6][7] voltage-tunable Fabry-Pérot micro-interferometers, [8] or broadband sensors requiring wavelength multiplexing. [9] A smart approach to significantly reduce the device complexity was presented by Gautam et al. [10] A single-pixel and single-layer device was used to achieve a wavelength-sensitive photocurrent response that can discriminate red, green, and blue (RGB) values via the polarization of a polymer film in an aqueous surrounding. Only recently, a system was presented that consists of a multilayer single pixel of graded-bandgap perovskites evoking a wavelength-sensitive photocurrent response. [11] Here, we present a single-chip wavelength sensor that exploits the dynamics of singlet and triplet states to discriminate a certain input signal. We employ a solution-processed host-guest system comprising organic room-temperature phosphors and fluorescent colloidal quantum dots (QDs), thereby introducing a new, promising application for organic room-temperature phosphorescence (RTP). The latter has been put to multifaceted use, [12] such as programmable luminescent tags, [13] oxygen sensing, [14] or moisture sensing. [15] Owing to their unique scalable optical properties, high quantum yield, and elevated photostability, colloidal quantum dots proved themselves valuable in a myriad of applications, like light-emitting diodes (LEDs), [16,17] solar cells, [18][19][20] or transistors. [21,22] Here, we present a single-layer approach that turns wavelength information into a distinct photocurrent response with a spectral resolution down to 1 nm and below while covering a wavelength range from 300 to 410 nm.Wavelength-discriminating systems typically consist of heavy benchtop-based instruments, comprising diffractive optics, moving parts, and adjacent detectors. For simple wavelength measurements, such as lab-on-chip light source calibration or laser wavelength tracking, which do not require polychromatic analysis and cannot handle bulky spectroscopy instruments, lightweight, easyto-process, and flexible single-pixel devices are attracting increasing atten...

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Novel Cobalt Complexes as a Dopant for Hole-transporting Material in Perovskite Solar Cells

Cited by 12 publications

References 23 publications

Efficiencyvs.stability: dopant-free hole transporting materials towards stabilized perovskite solar cells

Efficiencyvs.stability: dopant-free hole transporting materials towards stabilized perovskite solar cells

Li-Salt-Free, Coevaporated Cu(TFSI)₂-Doped Hole Conductors for Efficient CH₃NH₃PbI₃ Perovskite Solar Cells

Accurate Wavelength Tracking by Exciton Spin Mixing

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Novel Cobalt Complexes as a Dopant for Hole-transporting Material in Perovskite Solar Cells

Cited by 12 publications

References 23 publications

Efficiencyvs.stability: dopant-free hole transporting materials towards stabilized perovskite solar cells

Efficiencyvs.stability: dopant-free hole transporting materials towards stabilized perovskite solar cells

Li-Salt-Free, Coevaporated Cu(TFSI)2-Doped Hole Conductors for Efficient CH3NH3PbI3 Perovskite Solar Cells

Accurate Wavelength Tracking by Exciton Spin Mixing

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Resources

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Li-Salt-Free, Coevaporated Cu(TFSI)₂-Doped Hole Conductors for Efficient CH₃NH₃PbI₃ Perovskite Solar Cells