High efficiency mesoporous titanium oxide PbS quantum dot solar cells at low temperature

Ju, Tong; Graham, Rebekah L.; Zhai, Guangmei; Rodriguez, Yvonne; Breeze, Alison J.; Yang, Lily; Alers, Glenn; Carter, Sue A.

doi:10.1063/1.3459146

Cited by 69 publications

(50 citation statements)

References 22 publications

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“…1 2 To date, many QD materials have been developed. [3][4][5][6][7][8][9][10] Of these, Cd and Pb compounds such as CdSe, CdS, PbS, and PbSe are popular because of their high conversion efficiencies. Their suitability for use with conventional materials and their good quantum yields are advantageous in photochemical solar cells.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Charge Transportation in Si Quantum Dot-Sensitized Solar Cells Using Vanadium Doped TiO<SUB>2</SUB>

Seo¹,

Ichida

Hashimoto

et al. 2016

j nanosci nanotechnol

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The multiple exciton generation characteristics of quantum dots have been expected to enhance the performance of photochemical solar cells. In previous work, we first introduced Si quantum dot for sensitized solar cells. The Si quantum dots were fabricated by multi-hollow discharge plasma chemical vapor deposition, and were characterized optically and morphologically. The Si quantum dot-sensitized solar cells had poor performance due to significant electron loss by charge recombination. Although the large Si particle size resulted in the exposure of a large TiO2 surface area, there was a limit to ho much the particle size could be decreased due to the reduced absorbance of small particles. Therefore, this work focused on decreasing the internal impedance to improve charge transfer. TiO2 was electronically modified by doping with vanadium, which can improve electron transfer in the TiO2 network, and which is stable in the redox electrolyte. Photogenerated electrons can more easily arrive at the conductive electrode due to the decreased internal impedance. The dark photovoltaic properties confirmed the reduction of charge recombination, and the photon-to-current conversion efficiency reflected the improved electron transfer. Impedance analysis confirmed a decrease in internal impedance and an increased electron lifetime. Consequently, these improvements by vanadium doping enhanced the overall performance of Si quantum dot-sensitized solar cells.

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Section: Introductionmentioning

confidence: 99%

Improvement of Charge Transportation in Si Quantum Dot-Sensitized Solar Cells Using Vanadium Doped TiO<SUB>2</SUB>

Seo¹,

Ichida

Hashimoto

et al. 2016

j nanosci nanotechnol

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show abstract

“…However, FF reduced from 0.572 to 0.53, mainly owing to increased charge carrier recombination rate and larger shunt resistance indicated by the slope of J sc point of the J-V curve. Consequently, in one sun illumination condition, η of the bisensitized device with TiO 2 @CGS/N719 as photoanode could reach up to 7.4%, which is 23% higher than that with TiO 2 @N719 [61,62].…”

Section: Resultsmentioning

confidence: 81%

“…Thus, the introduction of sensitized CuGaS 2 QDs could enhance the light harvesting ability in TiO 2 /N719, which can be attributed to the following factors: a higher intensity and a red shift of light absorption edge from 600 nm to around 700 nm. Such improvement could lead to an increased electron concentration in TiO 2 /N719 substrate sensitized with CuGaS 2 QDs [56][57][58][59][60][61][62].…”

Section: Resultsmentioning

confidence: 99%

Enhanced performance of solar cells via anchoring CuGaS2 quantum dots

et al. 2017

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Ternary I-III-VI quantum dots (QDs) of chalcopyrite semiconductors exhibit excellent optical properties in solar cells. In this study, ternary chalcopyrite CuGaS 2 nanocrystals (2-5 nm) were one-pot anchored on TiO 2 nanoparticles (TiO 2 @CGS) without any long ligand. The solar cell with TiO 2 @CuGaS 2 /N719 has a power conversion efficiency of 7.4%, which is 23% higher than that of monosensitized dye solar cell. Anchoring CuGaS 2 QDs on semiconductor nanoparticles to form QDs/dye co-sensitized solar cells is a promising and feasible approach to enhance light absorption, charge carrier generation as well as to facilitate electron injection comparing to conventional mono-dye sensitized solar cells.

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“…34 Efficiencies of 5.1% and 8% at room temperature 35 and 170 K, 36 respectively, have also been reported for TiO 2 /PbS, which suggests that the efficiency limits may be much higher. These oxide/QD heterojunctions have the advantage of positioning the illuminated optical field maximum within the depleted region of the QD film, enabling high carrier collection efficiency while still allowing for thick, highly absorptive films.…”

Section: Improved Current Extraction From Zno/pbs Quantum Dot Heterojmentioning

confidence: 93%

Final Report for DE-FG36-08GO18007 "All-Inorganic, Efficient Photovoltaic Solid State Devices Utilizing Semiconducting Colloidal Nanocrystal Quantum Dots"

Bawendi¹

2011

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Executive Summary: We demonstrated robust colloidal quantum dot (QD) photovoltaics with high internal quantum efficiencies. In our structures, device durability is derived from use of all-inorganic atmospherically-stable semiconducting metal-oxide films together with QD photoreceptors. We have shown that both QD and metal-oxide semiconducting films and contacts are amenable to room temperature processing under minimal vacuum conditions, enabling large area processing of PV structures of high internal efficiency. We generated the state of the art devices with power conversion efficiency of more than 4%, and have shown that efficiencies as high as 9% are achievable in the near-term, and as high as 17% in the long-term. Motivation and Outcomes:Considerable interest in the incorporation of colloidal QDs and other quantum-confined semiconductor structures into photovoltaics (PVs) is due to their broad spectral tunability, strong optical absorption, and ease of processing. QDs made from the II-VI materials such as CdS, CdSe, and CdTe can be tuned in the visible, while IV-VI materials such as PbS and PbSe exhibit band-edge responses in the IR, even beyond λ = 2000 nm wavelength. As solution processable perfect crystals of tunable band gap, colloidal QD-PVs have a remarkable potential to advance the photovoltaic technology.

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High efficiency mesoporous titanium oxide PbS quantum dot solar cells at low temperature

Cited by 69 publications

References 22 publications

Improvement of Charge Transportation in Si Quantum Dot-Sensitized Solar Cells Using Vanadium Doped TiO<SUB>2</SUB>

Improvement of Charge Transportation in Si Quantum Dot-Sensitized Solar Cells Using Vanadium Doped TiO<SUB>2</SUB>

Enhanced performance of solar cells via anchoring CuGaS2 quantum dots

Final Report for DE-FG36-08GO18007 "All-Inorganic, Efficient Photovoltaic Solid State Devices Utilizing Semiconducting Colloidal Nanocrystal Quantum Dots"

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