The band alignment of Cu2O/ZnO and Cu2O/GaN heterostructures

Kramm, B.; Läufer, Andreas; Reppin, Daniel; Kronenberger, A.; Hering, P.; Polity, A.; Meyer, B. K.

doi:10.1063/1.3685719

Cited by 100 publications

(52 citation statements)

References 26 publications

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“…2,3,[15][16][17][18][19][20][21][22] In this manuscript, we describe the controlled modication of ZnO/Cu 2 O heterostructures to yield stoichiometric interfaces as well as nonstoichiometric interfaces with Cu and CuO present. We also show that stoichiometric interfaces are necessary for achieving large device voltages.…”

Section: Broader Contextmentioning

confidence: 99%

Interface stoichiometry control to improve device voltage and modify band alignment in ZnO/Cu₂O heterojunction solar cells

Wilson

Bosco

Tolstova

et al. 2014

Energy Environ. Sci.

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Section: Broader Contextmentioning

confidence: 99%

Interface stoichiometry control to improve device voltage and modify band alignment in ZnO/Cu₂O heterojunction solar cells

Wilson

Bosco

Tolstova

et al. 2014

Energy Environ. Sci.

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“…6,7 Several authors have measured negative, or "cliff"-type conductionband offsets between Cu 2 O and other materials to explain the cause of low V OC , including ZnO (À1.0 -À1.8 eV), 2,4,8,9 In 2 O 3 (À0.83 eV), 10 TiO 2 (À0.74 eV), 11 GaN (À0.23 eV), 8 as well as ZnS and ZnSe. 12 In the present study, we specifically measure n-type materials deposited by atomic layer deposition (ALD) or pulsed laser deposition on electrochemically Electronic band offsets are sensitive to grain orientation, 13 surface atomic termination, adsorbed extrinsic species, chemical reactions, and interdiffusion.…”

mentioning

confidence: 99%

Band offsets of n-type electron-selective contacts on cuprous oxide (Cu2O) for photovoltaics

Brandt

Young

Park

et al. 2014

Applied Physics Letters

105

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The development of cuprous oxide (Cu2O) photovoltaics (PVs) is limited by low device open-circuit voltages. A strong contributing factor to this underperformance is the conduction-band offset between Cu2O and its n-type heterojunction partner or electron-selective contact. In the present work, a broad range of possible n-type materials is surveyed, including ZnO, ZnS, Zn(O,S), (Mg,Zn)O, TiO2, CdS, and Ga2O3. Band offsets are determined through X-ray photoelectron spectroscopy and optical bandgap measurements. A majority of these materials is identified as having a negative conduction-band offset with respect to Cu2O; the detrimental impact of this on open-circuit voltage (VOC) is evaluated through 1-D device simulation. These results suggest that doping density of the n-type material is important as well, and that a poorly optimized heterojunction can easily mask changes in bulk minority carrier lifetime. Promising heterojunction candidates identified here include Zn(O,S) with [S]/[Zn] ratios >70%, and Ga2O3, which both demonstrate slightly positive conduction-band offsets and high VOC potential. This experimental protocol and modeling may be generalized to evaluate the efficiency potential of candidate heterojunction partners for other PV absorbers, and the materials identified herein may be promising for other absorbers with low electron affinities.

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“…[92] They applied photoelectron spectroscopy to The importance of the design of the interfaces to boost PCE was independently confirmed by Buonassisi and co workers. [93,94] They demonstrated the improved functionality in Cu 2 Obased solar cells using ALD to control the Cu oxida tion state at the interface between Cu 2 O and ZnO film.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 90%

Semiconducting Metal Oxide Nanostructures for Water Splitting and Photovoltaics

Concina

Ibupoto

Vomiero

2017

Advanced Energy Materials

125

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conduction and/or optical properties play a critical role, like in microelectronics, [17] sensing, [18,19] biosensing. [20] The possibility of exploring nanoarchi tectures for MOx (such as 0D, 1D, 2D, 3D) structures and extended networks [21,22] ) with electronic features different from their bulk counterpart [23,24] enabled their exploitation in a variety of new fields, in which networking in 3D is critical for a series of physical/chemical processes like light absorption and confinement, [25] sur face reactivity, [18,26] charge exchange/col lection. [27,28] For this reason, the possibility of extending MOx geometry from standard thin films to 3D architectures (including nanowires, nanorods, nanowalls, nano networks, and hierarchical structures), induced a renaissance for these materials, which are considered good candidates for successful application in the real life.The synthesis of composite MOx archi tectures experienced a strong and fast development in the last 15 years, now being a mature branch of Science, able to offer a diversified series of morphologies, shapes, and crystal line assemblies. [22,29] Scheme 1 illustrates the most commonly produced 0D to 2D structures (nanoparticles (NPs), nanowires (NWs), nanotubes (NTs), nanorods (NRs), nanosheets (NSs)) reported in the literature as building blocks to fabricated hier archically assembled geometries and/or nano/microarrays. In their work, [30] Umar and Hahn offer a comprehensive summary of MOx nanostructures, covering the synthesis and application, from both an experimental and theoretical point of view. Chem ical and physical preparation routes are described, including vapor transport and condensation techniques, hydrothermal and electrochemical synthesis, vacuum and nonvacuumbased techniques.While in the past focus was given on the development of new architectures and shapes through a series of physical and chemical routes, [21,22,29,31] now the research is much more focused on the investigation of the functional properties these new structures can offer, such functionalities being tailored for specific enduser applications.The research of new materials for renewable energy sources is one of the fields most benefitting of the outstanding proper ties of MOx. MOx find application in, for instance, solar cells, [32] electrochemical water splitting (WS), photoelectrochemical WS, photocatalysis. [33] In most of the cases, MOx are chosen for the possibility of having 3D networks with maximized specific sur face area, tunable bandgap allowing light absorption in a broad Metal oxide (MOx) semiconducting nanostructures hold the potential for playing a critical role in the development of a new platform for renewable energies, including energy conversion and storage through photovoltaic effect, solar fuels, and water splitting. Earth-abundant MOx nanostructures can be prepared through simple and scalable routes and integrated in operating devices, which enable exploitation of their outstanding optical, electronic, and catalytic properties. In this review, the ...

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The band alignment of Cu2O/ZnO and Cu2O/GaN heterostructures

Cited by 100 publications

References 26 publications

Interface stoichiometry control to improve device voltage and modify band alignment in ZnO/Cu₂O heterojunction solar cells

Interface stoichiometry control to improve device voltage and modify band alignment in ZnO/Cu₂O heterojunction solar cells

Band offsets of n-type electron-selective contacts on cuprous oxide (Cu2O) for photovoltaics

Semiconducting Metal Oxide Nanostructures for Water Splitting and Photovoltaics

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The band alignment of Cu2O/ZnO and Cu2O/GaN heterostructures

Cited by 100 publications

References 26 publications

Interface stoichiometry control to improve device voltage and modify band alignment in ZnO/Cu2O heterojunction solar cells

Interface stoichiometry control to improve device voltage and modify band alignment in ZnO/Cu2O heterojunction solar cells

Band offsets of n-type electron-selective contacts on cuprous oxide (Cu2O) for photovoltaics

Semiconducting Metal Oxide Nanostructures for Water Splitting and Photovoltaics

Contact Info

Product

Resources

About

Interface stoichiometry control to improve device voltage and modify band alignment in ZnO/Cu₂O heterojunction solar cells

Interface stoichiometry control to improve device voltage and modify band alignment in ZnO/Cu₂O heterojunction solar cells