Directly Deposited Quantum Dot Solids Using a Colloidally Stable Nanoparticle Ink

Fischer, A.; Rollny, Lisa R.; Pan, Jun; Carey, Graham H.; Thon, Susanna M.; Hoogland, Sjoerd; Voznyy, Oleksandr; Zhitomirsky, David; Kim, Jin Young; Bakr, Osman M.; Sargent, Edward H.

doi:10.1002/adma.201302147

Cited by 101 publications

(122 citation statements)

References 36 publications

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“…Noticeably lower recombination centre densities in unexchanged CQD films 35 support this hypothesis. Hence, a single-step deposition approach, in which the final transport-compatible short ligand is administered during the solution-phase exchange, is attractive for reasons of prospective performance as well as of manufacturability [53][54][55][56][57][58] .…”

Section: Discussionmentioning

confidence: 99%

Engineering colloidal quantum dot solids within and beyond the mobility-invariant regime

et al. 2014

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Colloidal quantum dots are attractive materials for efficient, low-cost and facile implementation of solution-processed optoelectronic devices. Despite impressive mobilities (1-30 cm 2 V À 1 s À 1 ) reported for new classes of quantum dot solids, it is-surprisingly-the much lower-mobility (10 À 3 -10 À 2 cm 2 V À 1 s À 1 ) solids that have produced the best photovoltaic performance. Here we show that it is not mobility, but instead the average spacing among recombination centres that governs the diffusion length of charges in today's quantum dot solids. In this regime, colloidal quantum dot films do not benefit from further improvements in charge carrier mobility. We develop a device model that accurately predicts the thickness dependence and diffusion length dependence of devices. Direct diffusion length measurements suggest the solid-state ligand exchange procedure as a potential origin of the detrimental recombination centres. We then present a novel avenue for in-solution passivation with tightly bound chlorothiols that retain passivation from solution to film, achieving an 8.5% power conversion efficiency.

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Section: Discussionmentioning

confidence: 99%

Engineering colloidal quantum dot solids within and beyond the mobility-invariant regime

et al. 2014

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“…[2][3][4][5][6][7][8][9] Since the pioneer work of Sargent and co-workers, [ 10 ] a variety of NCs have been investigated for fabricating inorganic NCs solar cells, such as CdTe, CuInGaSe 2 , CuZnSnS 4 , PbS, PbSe, Sb 2 Se 3 . [11][12][13][14][15][16][17][18][19][20][21][22] Recent efforts mainly focus on depleted heterojunction devices and achieved the effi ciencies of 6-7%. [ 23,24 ] An important criterion for selecting photovoltaic NCs is their carrier lifetime, which must be long enough to guarantee effective carrier transport and suppress recombination.…”

mentioning

confidence: 99%

In Situ Construction of Nanoscale CdTe‐CdS Bulk Heterojunctions for Inorganic Nanocrystal Solar Cells

Chen

Zhang

Zeng

et al. 2014

Advanced Energy Materials

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“…Although some molecules from the solution are also deposited, they may be able to evaporate or are considered to be harmless. A new development is the inkjet deposition of colloidal quantum dots (Tekin E. et al, 2008), which even allows the creation of structures in the layers (Fischer A. et al, 2013;Kirmani A.R. et al, 2014).…”

Section: Colloidal Depositionmentioning

confidence: 99%

Using Nanoparticles as a Bottom-up Approach to Increase Solar Cell Efficiency

Vece

2019

KONA

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Nanostructures in solar cells are used both for the active layers and for light management techniques. Particularly thin-film solar cells will benefit strongly from such nanoscale approaches as the light absorption needs to be improved. Nanoparticles produced by wet chemical techniques, sometimes in the form of quantum dots, are currently used to fabricate thin-film solar cells for research purposes. Light management studies use nanostructures that are often created by lithographic methods but which are too expensive for an industrial realisation. In this review paper, the opportunities for using nanoparticles as a bottom-up approach for both the active layer and light management nanostructures is discussed. Since both the wet chemical method and lithographic techniques have considerable limitations, the use of gas aggregation cluster sources is proposed as a promising method to advance the use of bottom-up nanoparticles for solar cells. Plasmonics, Mie scattering, quantum dots and new materials are reviewed with respect to the nanoparticle potential. The increase of solar cell efficiency by using ultra-clean and crystalline nanoparticles which are produced with a vacuum-compatible technique at low temperatures should be very interesting for science and technology, ultimately leading to industrial products.

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Directly Deposited Quantum Dot Solids Using a Colloidally Stable Nanoparticle Ink

Cited by 101 publications

References 36 publications

Engineering colloidal quantum dot solids within and beyond the mobility-invariant regime

Engineering colloidal quantum dot solids within and beyond the mobility-invariant regime

In Situ Construction of Nanoscale CdTe‐CdS Bulk Heterojunctions for Inorganic Nanocrystal Solar Cells

Using Nanoparticles as a Bottom-up Approach to Increase Solar Cell Efficiency

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