Exploration of charge transport materials to improve the radiation tolerance of lead halide perovskite solar cells

Murakami, Yoshiyuki; Nishikubo, Ryosuke; Ishiwari, Fumitaka; Okamoto, Kazumasa; Kozawa, Takahiro; Saeki, Akinori

doi:10.1039/d2ma00385f

Cited by 5 publications

(6 citation statements)

References 73 publications

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“…Even in this case the perovskite QFLS remains almost unchanged while the Si absorber shows a high variation (0.40 V) which is in line with the losses shown by the perovskite/Si architecture. Interestingly, values of n (Figure f) change only slightly for both light harvesters (in particular, in Si n < 1 for both pristine and irradiated devices because of Auger recombination which is known to be the dominant recombination mechanism in Si-based SCs) and for the perovskite/Si stack (from 2.55 to 2.50), confirming once again the radiation tolerance of MHPs (and PSCs in general), as also demonstrated by other literature results. − …”

Section: Radiation Resistance Of Metal Halide Perovskitessupporting

confidence: 86%

Advances in Perovskites for Photovoltaic Applications in Space

et al. 2022

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Perovskites have emerged as promising light harvesters in photovoltaics. The resulting solar cells (i) are thin and lightweight, (ii) can be produced through solution processes, (iii) mainly use low-cost raw materials, and (iv) can be flexible. These features make perovskite solar cells intriguing as space technologies; however, the extra-terrestrial environment can easily cause the premature failure of devices. In particular, the presence of high-energy radiation is the most dangerous factor that can damage space technologies. This Review discusses the status and perspectives of perovskite photovoltaics in space applications. The main factors used to describe the space environment are introduced, and the results concerning the radiation hardness of perovskites toward protons, electrons, neutrons, and γ-rays are presented. Emphasis is given to the physicochemical processes underlying radiation damage in such materials. Finally, the potential use of perovskite solar cells in extra-terrestrial conditions is discussed by considering the effects of the space environment on the choice of the architecture and components of the devices.

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Section: Radiation Resistance Of Metal Halide Perovskitessupporting

confidence: 86%

Advances in Perovskites for Photovoltaic Applications in Space

et al. 2022

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“…A surface passivation layer was prepared by spin‐coating an isopropyl alcohol (IPA) solution of (TAMT)I 3 or (TAT)I 3 (0.5–3.0 mg mL −1 ) on a binary mixed perovskite (BMP) film composed of MA 0.13 FA 0.87 PbI 2.61 Br 0.39 [MABr (or PbBr 2 ):FAI (or PbI 2 ) = 0.13:0.87]. [ 41 ] As a control, a BMP film sample, spin‐coated with only IPA, was also prepared. The surface structures of BMP were evaluated by 2D grazing‐incidence X‐Ray diffraction (2D‐GIXRD).…”

Section: Resultsmentioning

confidence: 99%

Triammonium Molecular Tripods as Organic Building Blocks for Hybrid Perovskite Solar Cells

Fukui,

Hofuku,

Kosaka

et al. 2024

Small Structures

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Considerable efforts have been devoted to the development of new organic‐inorganic hybrid perovskites as well as their passivation‐layer materials to improve the performance of solution‐processable thin‐film solar cells for practical applications. For this purpose, monocations, such as monoammonium ions, have been studied extensively as organic building blocks. Herein, a new class of cationic molecules featuring a triptycene framework is introduced, to which three ammonium ions are attached close to each other. Inspired by the previous finding that 1,8,13‐trisubstituted triptycenes have an excellent ability to form 2D assemblies, two derivatives with ammonium ion groups at these positions are synthesized, linked either directly or via methylene spacers. Hybrid perovskites with different dimensionalities in terms of the inorganic octahedral units were prepared by reaction of the triammonium‐appended triptycene tripods with PbI2, however, the optoelectronic properties obtained were unsatisfactory. Even so, the triammonium‐containing triptycene tripod having methylene spacers was shown to serve as a good passivation layer for perovskites solar cells (PSCs), leading to improvements in power conversion efficiency and long‐term stability. Given the large degree of design freedom, triptycene tripods merit further investigation as a new motif in the development of surface‐passivation materials for PSCs.

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“…These energy levels are suitable for the HTL (doped Spiro-OMeTAD in the present case), which transports holes through the cascade energy profile and blocks electrons from the binary mixed perovskite (PVK) of MA 0.13 FA 0.87 PbI 2.61 Br 0.39 [MABr (or PbBr 2 ):FAI (or PbI 2 ) = 0.13:0.87, where MA is methylammonium cation and FA is formamidinium cation]. 56 Although syn-and anti-PMs have almost identical frontier orbitals and electronic structure, the molecular symmetries of syn-and anti-PMs are different. C i symmetric anti-PM has a center of symmetry, but C 2 symmetric syn-PM has chirality without a center of symmetry, as evident from its chiral column chart (Figure S17 in Analytical Data).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The LUMO levels were calculated by adding the optical band gap (2.90 eV for both PMs), giving −2.53 and −2.45 eV for syn - and anti -PMs, respectively. These energy levels are suitable for the HTL (doped Spiro-OMeTAD in the present case), which transports holes through the cascade energy profile and blocks electrons from the binary mixed perovskite (PVK) of MA 0.13 FA 0.87 PbI 2.61 Br 0.39 [MABr (or PbBr 2 ):FAI (or PbI 2 ) = 0.13:0.87, where MA is methylammonium cation and FA is formamidinium cation] . Although syn - and anti -PMs have almost identical frontier orbitals and electronic structure, the molecular symmetries of syn - and anti -PMs are different.…”

Section: Resultsmentioning

confidence: 99%

Surface Passivation of Lead Halide Perovskite Solar Cells by a Bifacial Donor−π–Donor Molecule

Minoi

Ishiwari

Murotani

et al. 2023

ACS Appl. Mater. Interfaces

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Surface passivation is key to the power conversion efficiency (PCE) of organic− inorganic lead halide perovskite solar cells (PSCs). Herein, we report a novel molecular concept of a C 2 -symmetric syn-type bifacial donor−π−donor (D−π−D) passivation molecule (a racemic mixture of enantiomers) with hydrophobic phenyls and hydrophilic tetraethylene glycolsubstituted phenyls on each face of the indeno-[1,2-b]fluorene π-core. In addition to this bifacial amphiphilic π-core unit, triphenylamine, a well-established passivation donor, effectively passivated the PSC surface, facilitated hole transfer, and increased the maximum PCE from 18.43 to 19.74%.Another notable effect is the removal of remnant PbI 2 and the change in the perovskite orientation on the surface by the syn-type molecule. In contrast, the anti-type isomer degraded its long-term stability. We characterized the electrostatic and electronic properties of these molecules and highlighted the advantage of molecular strategy based on a bifacial structure and its stereochemistry.

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Exploration of charge transport materials to improve the radiation tolerance of lead halide perovskite solar cells

Abstract: Towards the application of perovskite solar cells (PSCs) in space, we extensively investigated the effects of electron beam irradiation on binary-mixed PSCs with various hole- and electron-transport materials.

Cited by 5 publications

References 73 publications

Advances in Perovskites for Photovoltaic Applications in Space

Advances in Perovskites for Photovoltaic Applications in Space

Triammonium Molecular Tripods as Organic Building Blocks for Hybrid Perovskite Solar Cells

Surface Passivation of Lead Halide Perovskite Solar Cells by a Bifacial Donor−π–Donor Molecule

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