Planar PbS quantum dot/C60 heterojunction photovoltaic devices with 5.2% power conversion efficiency

Klem, Ethan J. D.; Gregory, Chris; Cunningham, G.; Hall, Steve; Temple, Dorota; Lewis, Jay

doi:10.1063/1.4707377

Cited by 33 publications

(21 citation statements)

References 30 publications

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“…It should be noted that the photodoped devices we report here work on a fundamentally different mechanism as compared to more commonly reported planar heterojunction donor/acceptor (D/A) devices reported previously2930313233. In typical blend devices the relative donor to acceptor volume ratio is very high and the devices rely primarily on the absorption and conductivity of the donor material.…”

Section: Discussionmentioning

confidence: 72%

Ultrahigh Performance C60 Nanorod Large Area Flexible Photoconductor Devices via Ultralow Organic and Inorganic Photodoping

Saran

Stolojan

Curry

2014

Sci Rep

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One dimensional single-crystal nanorods of C60 possess unique optoelectronic properties including high electron mobility, high photosensitivity and an excellent electron accepting nature. In addition, their rapid large scale synthesis at room temperature makes these organic semiconducting nanorods highly attractive for advanced optoelectronic device applications. Here, we report low-cost large-area flexible photoconductor devices fabricated using C60 nanorods. We demonstrate that the photosensitivity of the C60 nanorods can be enhanced ~400-fold via an ultralow photodoping mechanism. The photodoped devices offer broadband UV-vis-NIR spectral tuneability, exhibit a detectivitiy >109 Jones, an external quantum efficiency of ~100%, a linear dynamic range of 80 dB, a rise time 60 µs and the ability to measure ac signals up to ~250 kHz. These figures of merit combined are among the highest reported for one dimensional organic and inorganic large-area planar photoconductors and are competitive with commercially available inorganic photoconductors and photoconductive cells. With the additional processing benefits providing compatibility with large-area flexible platforms, these devices represent significant advances and make C60 nanorods a promising candidate for advanced photodetector technologies.

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Section: Discussionmentioning

confidence: 72%

Ultrahigh Performance C60 Nanorod Large Area Flexible Photoconductor Devices via Ultralow Organic and Inorganic Photodoping

Saran

Stolojan

Curry

2014

Sci Rep

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“…In addition to the linear fit, literature V oc values are plotted in Figure 2 for comparison. These literature values were obtained from QD solar cells based on p -type PbS QDs and employing three different types of junctions; (1) metal-QD Schottky junction61920212223; (2) p – n heterojunction using n -type wide bandgap metal oxides such as TiO 2 or ZnO1224252627, or n -type organic materials (C60 and PCBM)2829; and (3) a recently introduced p - n homojunction using n -doped PbS QDs30. We obtained a V oc of 692 ± 7 mV from cells based on 2.9 nm PbS QDs (1.4 eV) under AM 1.5 G filtered spectral illumination (100 mW/cm 2 ), which is, to the best of our knowledge, the highest V oc ever demonstrated from a colloidal QD based solar cell.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Open-Circuit Voltage of PbS Nanocrystal Quantum Dot Solar Cells

Yoon

Boercker

Lumb

et al. 2013

Sci Rep

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Nanocrystal quantum dots (QD) show great promise toward improving solar cell efficiencies through the use of quantum confinement to tune absorbance across the solar spectrum and enable multi-exciton generation. Despite this remarkable potential for high photocurrent generation, the achievable open-circuit voltage (Voc) is fundamentally limited due to non-radiative recombination processes in QD solar cells. Here we report the highest open-circuit voltages to date for colloidal QD based solar cells under one sun illumination. This Voc of 692 ± 7 mV for 1.4 eV PbS QDs is a result of improved passivation of the defective QD surface, demonstrating as a function of the QD bandgap (Eg). Comparing experimental Voc variation with the theoretical upper-limit obtained from one diode modeling of the cells with different Eg, these results clearly demonstrate that there is a tremendous opportunity for improvement of Voc to values greater than 1 V by using smaller QDs in QD solar cells.

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“…For example, quantum dots could be used as replacements for chromophores in DSSCs, with a monolayer of size-tuned nanoparticles forming the broad spectral reach of semiconductors, and complemented by the well-understood charge transfer and back recombination blocking of the DSSC architecture. With their excellent efficiency in harvesting the visible portion of the Sun's spectrum, organic photovoltaics could be integrated with infrared-bandgap semiconductors 96 , such as colloidal quantum-dot solids, as the back cell in tandem or multijunction designs. While these various opportunities and challenges are addressed, solution-processed photovoltaics will continue to help drive higher performance at lower cost for the widespread deployment of solar-harvesting technology.…”

Section: Discussionmentioning

confidence: 99%

Materials interface engineering for solution-processed photovoltaics

Gräetzel

Janssen

Mitzi

et al. 2012

Nature

1,022

805

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Advances in solar photovoltaics are urgently needed to increase the performance and reduce the cost of harvesting solar power. Solution-processed photovoltaics are cost-effective to manufacture and offer the potential for physical flexibility. Rapid progress in their development has increased their solar-power conversion efficiencies. The nanometre (electron) and micrometre (photon) scale interfaces between the crystalline domains that make up solution-processed solar cells are crucial for efficient charge transport. These interfaces include large surface area junctions between photoelectron donors and acceptors, the intralayer grain boundaries within the absorber, and the interfaces between photoactive layers and the top and bottom contacts. Controlling the collection and minimizing the trapping of charge carriers at these boundaries is crucial to efficiency.

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Planar PbS quantum dot/C60 heterojunction photovoltaic devices with 5.2% power conversion efficiency

Cited by 33 publications

References 30 publications

Ultrahigh Performance C60 Nanorod Large Area Flexible Photoconductor Devices via Ultralow Organic and Inorganic Photodoping

Ultrahigh Performance C60 Nanorod Large Area Flexible Photoconductor Devices via Ultralow Organic and Inorganic Photodoping

Enhanced Open-Circuit Voltage of PbS Nanocrystal Quantum Dot Solar Cells

Materials interface engineering for solution-processed photovoltaics

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