Direct evidence of type II band alignment in ZnO nanorods/poly(3-hexylthiophene) heterostructures

Chan, Ming-Hui; Chen, J. Y.; Lin, Tong; Chen, Y. F.

doi:10.1063/1.3676267

Cited by 16 publications

(13 citation statements)

References 20 publications

(24 reference statements)

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“…In order to to ZnO NWs, which is in contrast to the ZnO NW / PCBM interface where the introduction of ZnO NWs has no effect. From photoluminescence measurements, Chan et al showed the occurrence of a radiative emission around 1.3 eV, which was assigned to the type II radiative transition between electrons in the CBM of ZnO NWs that recombine with the holes in the HOMO of P3HT [187]. Tables 5 and 6 and commented in the following sections.…”

Section: Pbs and Binary Sulfides Bulk-heterojunction Quantum Dot Solamentioning

confidence: 98%

ZnO nanowires for solar cells: a comprehensive review

et al. 2019

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As an abundant and non-toxic wide band gap semiconductor with a high electron mobility, ZnO in the form of nanowires has emerged as an important electron transporting material in a vast number of nanostructured solar cells. ZnO nanowires are grown by low-cost chemical deposition techniques and their integration into solar cells presents, in principle, significant advantages including efficient optical absorption through light trapping phenomena and enhanced charge carrier separation and collection. However, they also raise some significant issues related to the control of the interface properties and to the technological integration. The present review is intended to report a detailed analysis of the state-of-the-art of all types of nanostructured solar cells integrating ZnO nanowires, including extremely thin absorber solar cells, quantum dot solar cells, dye-sensitized solar cells, organic and hybrid solar cells, as well as halide perovskite-based solar cells.

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Section: Pbs and Binary Sulfides Bulk-heterojunction Quantum Dot Solamentioning

confidence: 98%

ZnO nanowires for solar cells: a comprehensive review

et al. 2019

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“…In the present case the PVA molecules are most likely to get attached to the ZnO NW surface by forming a complex bond with the ionized V Zn defects through weak electrostatic attraction. 123 Other polymers such as polymethyl methacrylate (PMMA), 87 polymerized acrylonitrile (PAN), 117 poly(styrene-co-maleic acid) (PS-co-MAc), 118 polystyrene sulfate (PSS) 118 and poly(3hexylthiophene) (P3HT) 119 were also successfully utilized for the fabrication of NW HS. These HS exhibit significant improvement in photoluminescence (PL) and photocurrent (PC) behaviours.…”

Section: Zno/organic Radial Heterostructuresmentioning

confidence: 99%

ZnO Nanowire Heterostructures: Intriguing Photophysics and Emerging Applications

Dhara¹,

Giri²

2013

Rev Nanosci Nanotech

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Over the last decades, semiconductor nanowires have been extensively studied for their applications in several disciplines. Many of these applications require heterostructures, which can be defined as the combination of two or more materials within the same nanowire structure. Recent research on the ZnO nanowires (NWs) heterostructures shows the possibility to overcome the existing limitation of the bare ZnO NWs based optoelectronic devices. Prospects for the commercialization of ZnO NWs based devices using the heterostructure approach are intensively pursued at present. This review article summarizes the current status of research worldwide and the findings from our group on various aspects of the ZnO NW heterostructures: fabrication methodologies, structural characterization, photophysical properties and related emerging applications. The fascinating properties of the ZnO NW heterostructures and its applications in different devices, mainly UV photodetectors, light-emitting-diodes, dye sensitized or quantum dots sensitized solar cells and photoelectrochemical cells are discussed. Focus of the article is on the impact of heterostructure approach on the selective properties and performance of the ZnO NWs based devices. The improvements in the key parameters of these devices are also discussed to highlight the effectiveness of the heterostructure approach and a future outlook of the field is presented at the end.

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“…In organic/inorganic hybrid systems, for instance, their major advantages for optoelectronic applications are seen in the strong light-matter coupling of the organic components, while the inorganic counterparts excel in large carrier mobilities and thus efficient charge-carrier transport as well as small exciton binding energies. [6][7][8][9][10] Prerequisite for that is the lightinduced creation of hybrid or charge-transfer excitons, which exhibit the hole to a large extent on one side of the interface while the excited electron would reside on the other side. [4,5] Type-II alignment, in turn, is favored for a hybrid solar cell where optical absorption of sunlight is expected to directly lead to electron-hole separation.…”

Section: Introductionmentioning

confidence: 99%

“…These properties together with a type‐I level alignment at the hybrid interface would be ideally suited for light‐emitting applications . Type‐II alignment, in turn, is favored for a hybrid solar cell where optical absorption of sunlight is expected to directly lead to electron‐hole separation . Prerequisite for that is the light‐induced creation of hybrid or charge‐transfer excitons, which exhibit the hole to a large extent on one side of the interface while the excited electron would reside on the other side.…”

Section: Introductionmentioning

confidence: 99%

Electronic and Optical Excitations at the Pyridine/ZnO(101¯0) Hybrid Interface

Turkina

Nabok

Guļāns

et al. 2018

Advcd Theory and Sims

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By combining all-electron density-functional theory with many-body perturbation theory, a prototypical inorganic/organic hybrid system, composed of pyridine molecules that are chemisorbed on the nonpolar ZnO(1010) surface is investigated. The G 0 W 0 approximation is employed to describe its one-particle excitations in terms of the quasiparticle band structure, and the Bethe-Salpeter equation is solved to obtain the absorption spectrum. The different character of the constituents leads to very diverse self-energy corrections of individual Kohn-Sham states, and thus the G 0 W 0 band structure is distinctively different from its DFT counterpart, that is, many-body effects cannot be regarded as a rigid shift of the conduction bands. The nature of the optical excitations at the interface over a wide energy range is explored and it is shown that various kinds of electron-hole pairs are formed, comprising hybrid excitons and (hybrid) charge-transfer excitations. The absorption onset is characterized by a strongly bound brightZnO-dominated hybrid exciton. For the selected examples of either exciton type, the individual contributions from the valence and conduction bands are analyzed and the binding strength and extension of the electron-hole wavefunctions are discussed.

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Direct evidence of type II band alignment in ZnO nanorods/poly(3-hexylthiophene) heterostructures

Cited by 16 publications

References 20 publications

ZnO nanowires for solar cells: a comprehensive review

ZnO nanowires for solar cells: a comprehensive review

ZnO Nanowire Heterostructures: Intriguing Photophysics and Emerging Applications

Electronic and Optical Excitations at the Pyridine/ZnO(101¯0) Hybrid Interface

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