Double‐Sided Junctions Enable High‐Performance Colloidal‐Quantum‐Dot Photovoltaics

Liu, Mengxia; Arquer, F. Pelayo Garcı́a de; Li, Yiying; Lan, Xinzheng; Kim, Gi-Hwan; Voznyy, Oleksandr; Jagadamma, Lethy Krishnan; Abbas, Abdullah Saud; Hoogland, Sjoerd; Lu, Zheng‐Hong; Kim, Jin Young; Amassian, Aram; Sargent, Edward H.

doi:10.1002/adma.201506213

Cited by 126 publications

(100 citation statements)

References 30 publications

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“…In the cathode side, the component and morphology of the ZnO film, the interface between the ZnO film and the PbS QDs film are all important factors. For instance, boron, nitrogen, indium, and magnesium were incorporated into the ZnO film to adjust its band gap structure and strengthen the depletion region at the ZnO/PbS interface. Nanowire array ZnO was adopted to shorten the transfer path and speed up photoelectron extraction; Modifications of the ZnO film surface using chalcogenides, conjugated polyelectrolyte, thin oxide, and CdSe quantum dot were implemented to facilitate carrier transfer from the PbS QDs to the ZnO film.…”

Section: Average Values and Standard Deviations From The 20 Devices Fmentioning

confidence: 99%

Enhancing Electron and Hole Extractions for Efficient PbS Quantum Dot Solar Cells

et al. 2017

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Exploring ways capable of enhancing photocarrier extraction is crucial in further developing the current PbS quantum dots (QDs) solar cells with a standard architecture of ITO/ZnO/PbS‐TBAI/PbS‐EDT/Au, which are drawing enormous attention due to their high air stabilities and already achieved high power conversion efficiencies. Here, a thin layer of carbon QDs (CQDs) is employed to modify the ZnO film surface to improve photoelectron extraction, and a thin film of PbS QDs treated by a mixed ligand solution of EDT:CuI (PbS‐EDT:CuI) is used to replace the PbS‐EDT film to improve photohole extraction. This designed device (ITO/ZnO/CQDs/PbS‐TBAI/PbS‐EDT:CuI/Au) presents significantly improved PCE of 9.95% compared to 8.60% of the reference device (ITO/ZnO/PbS‐TBAI/PbS‐EDT/Au). In addition, the designed device shows very high air stability.

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Section: Average Values and Standard Deviations From The 20 Devices Fmentioning

confidence: 99%

Enhancing Electron and Hole Extractions for Efficient PbS Quantum Dot Solar Cells

et al. 2017

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“…Sol–gel‐derived ZnO films are often employed and can feature different nanostructures, interface engineering strategies, and dopants . Recent certified record PCEs have been achieved using spin‐coated ZnO nanoparticles that exhibited several advantages over sol–gel‐derived ZnO films, such as improved conductivity due to larger grain size, improved thickness control, and film formation without additional heat treatment (sol–gel‐derived ZnO requires 200 °C annealing), and suitability for mass‐production and printable devices. Recently, Jang and co‐workers explicitly compared the device performance of CQD PV devices employing ZnO nanoparticles and sol–gel‐derived ZnO films, while using the same device configuration, and demonstrated the superiority of ZnO nanoparticles …”

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confidence: 99%

“…Several approaches have been developed to reduce the surface defect density in ZnO, such as using interlayers, and organic and inorganic passivating agents . The interlayer strategies, including self‐assembled monolayers and conjugated polymers introduced on top of ZnO films, prevent the direct contact between the electron transport layers and the CQD layer and form an interfacial dipole that favors electron extraction .…”

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confidence: 99%

Chloride Passivation of ZnO Electrodes Improves Charge Extraction in Colloidal Quantum Dot Photovoltaics

et al. 2017

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The tunable bandgap of colloidal quantum dots (CQDs) makes them an attractive material for photovoltaics (PV). The best present-day CQD PV devices employ zinc oxide (ZnO) as an electron transport layer; however, it is found herein that ZnO's surface defect sites and unfavorable electrical band alignment prevent devices from realizing their full potential. Here, chloride (Cl)-passivated ZnO generated from a solution of presynthesized ZnO nanoparticles treated using an organic-solvent-soluble Cl salt is reported. These new ZnO electrodes exhibit decreased surface trap densities and a favorable electronic band alignment, improving charge extraction from the CQD layer and achieving the best-cell power conversion efficiency (PCE) of 11.6% and an average PCE of 11.4 ± 0.2%.

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“…[3][4][5][6][7][8][9][10][11][12] In the research on CQD surface engineering, effective halide-passivation successfully reduced the trap state density of CQDs, achieving increased charge drift and charge diffusion. [3][4][5][6][7][8][9][10][11][12] In the research on CQD surface engineering, effective halide-passivation successfully reduced the trap state density of CQDs, achieving increased charge drift and charge diffusion.…”

mentioning

confidence: 99%

Improved Processability and Efficiency of Colloidal Quantum Dot Solar Cells Based on Organic Hole Transport Layers

Aqoma

Mubarok

Lee

et al. 2018

Advanced Energy Materials

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IntroductionColloidal quantum dot (CQD) based photovoltaic devices (CQDPVs) have emerged as promising next-generation solar cells owing to low-cost solution processibility at low temperature, easy bandgap tunability into the near infrared (NIR, λ > 800 nm) regime, and multiple exciton generation. [1,2] The power conversion efficiency (PCE) of CQDPVs has improved High-efficiency solid-state-ligand-exchange (SSE) step-free colloidal quantum dot photovoltaic (CQDPV) devices are developed by employing CQD ink based active layers and organic (Polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7) and poly(3-hexylthiophene) (P3HT)) based hole transport layers (HTLs). The device using PTB7 as an HTL exhibits superior performance to that using the current leading organic HTL, P3HT, because of favorable energy levels, higher hole mobility, and facilitated interfacial charge transfer. The PTB7 based device achieves power conversion efficiency (PCE) of 9.60%, which is the highest among reported CQDPVs using organic HTLs. This result is also comparable to the PCE of an optimized device based on a thiol-exchanged p-type CQD, the current-state-of-the-art HTL. From the viewpoint of device processing, the fabrication of CQDPVs is achieved by direct single-coating of CQD active layers and organic HTLs at low temperature without SSE steps. The experimental results and device simulation results in this work suggest that further engineering of organic HTL materials can open new doors to improve the performance and processing of CQDPVs.

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Double‐Sided Junctions Enable High‐Performance Colloidal‐Quantum‐Dot Photovoltaics

Cited by 126 publications

References 30 publications

Enhancing Electron and Hole Extractions for Efficient PbS Quantum Dot Solar Cells

Enhancing Electron and Hole Extractions for Efficient PbS Quantum Dot Solar Cells

Chloride Passivation of ZnO Electrodes Improves Charge Extraction in Colloidal Quantum Dot Photovoltaics

Improved Processability and Efficiency of Colloidal Quantum Dot Solar Cells Based on Organic Hole Transport Layers

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