Dopant‐Free Zinc Chlorophyll Aggregates as an Efficient Biocompatible Hole Transporter for Perovskite Solar Cells

Li, Mengzhen; Li, Yue; Sasaki, Shin‐ichi; Song, Jiaxing; Wang, Chen; Tamiaki, Hitoshi; Tian, Wenjing; Chen, Gang; Miyasaka, Tsutomu; Wang, Xiaofeng

doi:10.1002/cssc.201601069

Cited by 65 publications

(76 citation statements)

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“…DSC, as a suitable dye sensitizer, exhibits a promising photovoltaic potential, and features a carboxy group at the C3 2 position on the chlorin macrocycle for covalent bonding with the TiO 2 nanocrystalline films. Some solution‐based DSSCs based on DSC have been investigated previously . In contrast, it has been observed that HTC‐1 and HTC‐2 show efficient charge transport with high mobilities owing to the combination of π–π stacking of the chlorin cores and coordination of the central zinc ion with the 3 1 ‐hydroxy or 3 1 ‐methoxy group of a neighboring molecule, leading to the formation of slipped‐stack structures with J ‐type excitonic coupling .…”

Section: Resultsmentioning

confidence: 99%

“…Chlorophylls (Chls), which are the most abundant natural pigments, play key roles in early photophysical and ‐chemical events in natural photosynthesis . In the last decade, we have carried out a series of investigations to explore the possibility of employing Chls and their derivatives in emerging photovoltaic techniques, such as biomimetic systems, DSSCs, organic solar cells (OSCs), and perovskite solar cells (PSCs) . These investigations are purely based on the fact that Chls are the only naturally occurring organic semiconductors that possess the merits of large‐scale resources, pollution free, and optoelectrical variability.…”

Section: Introductionmentioning

confidence: 99%

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Chlorophyll‐Based Organic–Inorganic Heterojunction Solar Cells

Zhao

et al. 2017

Chemistry A European J

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Solid-state chlorophyll solar cells (CSCs) employing a carboxylated chlorophyll derivative, methyl trans-3 -carboxypyropheophorbide a, as a light-harvesting dye sensitizer chlorophyll (DSC) deposited on mesoporous TiO , on which four zinc hydroxylated chlorophyll derivatives were spin-coated for hole transporter chlorophylls (HTCs), are described. Key parameters, including the effective carrier mobility of the HTC films, as determined by the space charge-limited current method, and the frontier molecular orbitals of these DSCs and HTCs, as estimated from cyclic voltammetry and electronic absorption spectra, suggest that both charge separation and carrier transport are favorable. The power conversion efficiencies (PCEs) of the present CSCs with fluorine-doped tin oxide (FTO)/TiO /DSC/HTCs/Ag were determined to follow the order of HTC-1>HTC-2>HTC-3>HTC-4, which coincided perfectly with the order of their hole mobilities. The maximum PCE achieved was 0.86 % with HTC-1. The photovoltaic devices studied herein with two types of chlorophyll derivatives as dye sensitizers and hole transporters provide a unique solution for the utilization of solar energy with a view to truly realizing "green energy".

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chlorophyll‐Based Organic–Inorganic Heterojunction Solar Cells

Zhao

et al. 2017

Chemistry A European J

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“…[141,143] For example, Hua et al reported two Ag-based metal organic complexes (HA1 ( Figure 15) and HA2) as dopant-free HTMs for CH 3 NH 3 PbI 3 PSCs. [141,143] For example, Hua et al reported two Ag-based metal organic complexes (HA1 ( Figure 15) and HA2) as dopant-free HTMs for CH 3 NH 3 PbI 3 PSCs.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Less is More: Dopant‐Free Hole Transporting Materials for High‐Efficiency Perovskite Solar Cells

Zhou

Wen

Gao

2018

Advanced Energy Materials

252

217

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years, the demands for reducing the fabrication costs and the energy payback time of photovoltaic devices led to the invention of emerging third-generation PV technologies, such as dye-sensitized solar cells (DSSCs), organic photovoltaic (OPV), quantum dots solar cells, and the latest perovskite solar cells (PSCs). Among them, PSC is the only technology that combines both merits of low processing energy cost and high power conversion efficiency (PCE), which makes it possible to replace the silicon-based PV technology.Since the first reports by Bach and Grätzel et al. about the use of 2,2′,7,7′tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD) as the hole-transporting material (HTM) in solid-state DSSCs (ssDSSC), spiro-OMeTAD becomes the benchmark of all the new HTMs developed for ssDSSC and PSCs. Contrary to the popular myth, spiro-OMeTAD is not completely amorphous but a semi-crystalline organic p-type semiconductor with a glass transition temperature of 121 °C and a melting point of 246 °C. [1] Its chemical structure is shown in Figure 1a and Grätzel's lab first revealed the crystal structure in 2014 [2] ( Figure 1b). It has a large bandgap of 2.98 eV and yields almost colorless thin films when deposited from solution in organic solvents such as toluene or chlorobenzene. The first oxidation potential of spiro-OMeTAD is found to be approximately −5.1 eV as derived from electrochemical and photoelectron spectroscopy measurements. [3] In the case of the solid-state PSCs reported since 2012, [4,5] the PCE of lab-made devices has increased from 9.7% [6] to above 21% [7] in 2017, owing to the improvement in the perovskite composition and device engineering. However, on account of several desirable properties, (i) favorable glass transition temperature; (ii) reasonable solubility; (iii) proper ionization potential; (iii) low visible light absorption; and (iv) appropriate solid-state morphology, spiro-OMeTAD has remained as the material of choice when high PCEs are demanded. Due to the fact that spiro-OMeTAD suffers from a relatively low conductivity in its pristine form, all the eyecatching PCEs were achieved by adding additives and/or dopants-a standard technique used to tune the electrical properties of both organic and inorganic semiconductors. Typical additives including 4-tert-butylpyridine (TBP) and lithium bis(trifluoromethyl sulfonyl)imide (LiTFSI) were added to the spin-coating formulation of spiro-MeOTAD and Perovskite solar cells have delivered power conversion efficiency beyond 22% in less than seven years, implying the potential for the paradigm shift of lowcost photovoltaics with high efficiency and low embedded energy. Besides the "perovskite fever," the development of new hole transport materials (HTM), especially dopant-free HTMs, is another research hotspot. This is because the currently used HTMs, such as spiro-OMeTAD derivatives, require additional chemical doping process to ensure sufficient conductivity and proper ionic potential level for efficient hole transport and colle...

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“…The unique spectral properties of J and H aggregates are attracting increasing attention as regards practical implementation for solar energy . Here we have pointed out another possible important application of a JH aggregate as the prime absorbing medium of a luminescent solar concentrator.…”

Section: Discussionmentioning

confidence: 93%

Dye Aggregates in Luminescent Solar Concentrators

Eisfeld

Briggs

2017

Physica Status Solidi (a)

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In this paper the design of a luminescent solar concentrator (LSC) in which dye aggregates with cylindrical geometry are embedded in the LSC plate with the long cylinder axis orthogonal to the faces of the plate is proposed. The most suitable aggregates are those exhibiting a blue‐shifted (with respect to monomer absorption) H band and a narrow red‐shifted J band. Such aggregates have high primary absorption into the H band which is polarized in the plane of the LSC and emission from the J band which is polarized perpendicular to the plane. Hence the emitted light is directed predominantly to the edges of the LSC and loss into the escape zone is much reduced.

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Dopant‐Free Zinc Chlorophyll Aggregates as an Efficient Biocompatible Hole Transporter for Perovskite Solar Cells

Cited by 65 publications

References 58 publications

Chlorophyll‐Based Organic–Inorganic Heterojunction Solar Cells

Chlorophyll‐Based Organic–Inorganic Heterojunction Solar Cells

Less is More: Dopant‐Free Hole Transporting Materials for High‐Efficiency Perovskite Solar Cells

Dye Aggregates in Luminescent Solar Concentrators

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