Synergistic Doping of Fullerene Electron Transport Layer and Colloidal Quantum Dot Solids Enhances Solar Cell Performance

Yuan, Mingjian; Voznyy, Oleksandr; Zhitomirsky, David; Kanjanaboos, Pongsakorn; Sargent, Edward H.

doi:10.1002/adma.201404411

Cited by 77 publications

(79 citation statements)

References 33 publications

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“…They are also used as 'n-type' transport layers in hybrid optoelectronics such as nanocrystal diodes 1 or organohalide perovskite solar cells. 2 In spite of the great success of the methanofullerene semiconductors in delivering state-of-the-art device performance metrics in specific applications, a number of fundamental issues concerning the solid-state physics of films of the materials remain unclear.…”

Section: Introductionmentioning

confidence: 99%

On the unipolarity of charge transport in methanofullerene diodes

et al. 2017

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Fullerenes are electron transporting organic semiconductors with a wide range of applications. In particular, methanofullerenes have been the preferred choice for solution-processed solar cells and photodiodes. The wide applicability of fullerenes as both ‘n-type’ transport materials and electron acceptors is clear. However, what is still a matter of debate is whether the fullerenes can also support efficient transport of holes, particularly in diode geometries. In this letter, we utilize a number of recently developed experimental methods for selective electron and hole mobility measurements. We show for the two most widely used solution processable fullerenes, PC70- and-PC60BM, that whilst both exhibit electron mobilities as high as 10−3 cm2/Vs, their hole mobilities are < 10−9 cm2/Vs. Thus charge transport in these fullerenes can be considered predominantly unipolar in diode configurations.

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Section: Introductionmentioning

confidence: 99%

On the unipolarity of charge transport in methanofullerene diodes

et al. 2017

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“…Introducing buffer layers into CQD solar cells can also be used as a band engineering tool and can reduce carrier loss at interfaces [219][220][221]. Organic materials are good buffer candidates as they exhibit low trap state densities.…”

Section: Band Engineering In Cqd Solar Cellsmentioning

confidence: 99%

“…Organic materials are good buffer candidates as they exhibit low trap state densities. One demonstration used a [6,6]-phenyl-C61-butyric acid methylester (PCBM) buffer layer in a CQD heterojunction solar cell which resulted in long carrier lifetimes, leading to 20% PCE enhancement over a control device without the buffer layer [220].…”

Section: Band Engineering In Cqd Solar Cellsmentioning

confidence: 99%

Advancing colloidal quantum dot photovoltaic technology

et al. 2016

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Colloidal quantum dots (CQDs) are attractive materials for solar cells due to their low cost, ease of fabrication and spectral tunability. Progress in CQD photovoltaic technology over the past decade has resulted in power conversion efficiencies approaching 10%. In this review, we give an overview of this progress, and discuss limiting mechanisms and paths for future improvement in CQD solar cell technology. We briefly summarize nanoparticle synthesis and film processing methods and evaluate the optoelectronic properties of CQD films, including the crucial role that surface ligands play in materials performance. We give an overview of device architecture engineering in CQD solar cells. The compromise between carrier extraction and photon absorption in CQD photovoltaics is analyzed along with different strategies for overcoming this trade-off. We then focus on recent advances in absorption enhancement through innovative device design and the use of nanophotonics. Several light-trapping schemes, which have resulted in large increases in cell photocurrent, are described in detail. In particular, integrating plasmonic elements into CQD devices has emerged as a promising approach to enhance photon absorption through both near-field coupling and far-field scattering effects. We also discuss strategies for overcoming the single junction efficiency limits in CQD solar cells, including tandem architectures, multiple exciton generation and hybrid materials schemes. Finally, we offer a perspective on future directions for the field and the most promising paths for achieving higher device efficiencies.

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“…[7][8][9][10] On the other hand, due to the special optical effect from the quantum size, quantum dots (QDs) have been widely used in many areas, such as solar energy cells, biosensor application. 11,12 Among many QDs, CdS was the most in-depth research, and the most widely used in the application. In the composite system, CdS was often used as donors.…”

Section: Introductionmentioning

confidence: 99%

A direct investigation of photocharge transfer across monomolecular layer between C60 and CdS quantum dots by photoassisted conductive atomic force microscopy

Jiang

Zhang

et al. 2016

AIP Advances

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The composite assembly of C60 and CdS Quantum Dots (QDs) on ITO substrate was prepared by Langmuir-Blodgett (LB) technique using arachic acid (AA), stearic acid (SA) and octadecanyl amine (OA) as additives. Photoassisted conductive atomic force microscopy was used to make point contact current-voltage (I-V) measurements on both the CdS QDs and the composite assembly of C60/CdS. The result make it clear that the CdS, C60/CdS assemblies deposited on ITO substrate showed linear characteristics and the current increased largely under illumination comparing with that in the dark. The coherent, nonresonant tunneling mechanism was used to explain the current occurrence. It is considered that the photoinduced carriers CdS QDs tunneled through alkyl chains increased the current rapidly.

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Synergistic Doping of Fullerene Electron Transport Layer and Colloidal Quantum Dot Solids Enhances Solar Cell Performance

Cited by 77 publications

References 33 publications

On the unipolarity of charge transport in methanofullerene diodes

On the unipolarity of charge transport in methanofullerene diodes

Advancing colloidal quantum dot photovoltaic technology

A direct investigation of photocharge transfer across monomolecular layer between C60 and CdS quantum dots by photoassisted conductive atomic force microscopy

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