Ordered Nanopillar Structured Electrodes for Depleted Bulk Heterojunction Colloidal Quantum Dot Solar Cells

Kramer, Illan J.; Zhitomirsky, David; Bass, John D.; Rice, Philip M.; Topuria, Teya; Krupp, Leslie; Thon, Susanna M.; Ip, Alexander H.; Debnath, Ratan; Kim, Ho-Cheol; Sargent, Edward H.

doi:10.1002/adma.201104832

Cited by 124 publications

(132 citation statements)

References 22 publications

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“…As opposed to the top-down method, bottom-up fabrication of nanostructures is an enticing approach to fabricate nanostructures without using costly processes such as lithography and dry-etching. [ 5,17,22,32,51,63,64,[74][75][76][77] As an example, Fan et al reported ordered arrays of Germanium (Ge) dual-diameter Nanopillars (DNPLs) with different diameters at the tip and base fabricated inside self-organized anodic aluminum oxide (AAO) templates. Such DNPLs presented an impressive absorption of 99% of the incident light over a wavelength ranging from 300 to 900 nm with a thickness of only 2 µm.…”

Section: Brief Review Of Light Harvesting With Nanostructuresmentioning

confidence: 98%

Progress and Design Concerns of Nanostructured Solar Energy Harvesting Devices

Leung

Zhang

Tavakoli

et al. 2016

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Integrating devices with nanostructures is considered a promising strategy to improve the performance of solar energy harvesting devices such as photovoltaic (PV) devices and photo-electrochemical (PEC) solar water splitting devices. Extensive efforts have been exerted to improve the power conversion efficiencies (PCE) of such devices by utilizing novel nanostructures to revolutionize device structural designs. The thicknesses of light absorber and material consumption can be substantially reduced because of light trapping with nanostructures. Meanwhile, the utilization of nanostructures can also result in more effective carrier collection by shortening the photogenerated carrier collection path length. Nevertheless, performance optimization of nanostructured solar energy harvesting devices requires a rational design of various aspects of the nanostructures, such as their shape, aspect ratio, periodicity, etc. Without this, the utilization of nanostructures can lead to compromised device performance as the incorporation of these structures can result in defects and additional carrier recombination. The design guidelines of solar energy harvesting devices are summarized, including thin film non-uniformity on nanostructures, surface recombination, parasitic absorption, and the importance of uniform distribution of photo-generated carriers. A systematic view of the design concerns will assist better understanding of device physics and benefit the fabrication of high performance devices in the future.

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Section: Brief Review Of Light Harvesting With Nanostructuresmentioning

confidence: 98%

Progress and Design Concerns of Nanostructured Solar Energy Harvesting Devices

Leung

Zhang

Tavakoli

et al. 2016

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“…In solar cells, these materials have recently exceeded 7% certified power conversion efficiency (PCE) 5,12,13 , offering a promising path towards efficient, low-cost and roll-to-roll processed photovoltaics (PVs). Recent efforts have concentrated on eliminating trap states detrimental to carrier lifetime 5,14,15 , investigating the impact of size polydispersity on an ensemble of CQDs 16,17 , improving charge collection 13,18,19 , characterizing field-effect mobility in these materials [20][21][22][23] and developing novel doping strategies to enable new high-efficiency device architectures 6,[24][25][26] . However, present-day devices still suffer from current densities and fill factors that are well below their theoretical potential.…”

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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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“…By contrast, the J sc can be enhanced remarkably in the bulk HQDSCs [ Fig. 16(c)], 135 in which nanostructured metal oxides, such as pillars 137 or NW arrays, 135,[138][139][140][141][142][143] are applied and CQDs are interpenetrated into these nanostructured metal oxide. Such a bulk junction structure allows for the extension of the depletion region as long as micrometers, which results in a great enhancement in optical absorption, charge separation, and collection efficiency simultaneously.…”

Section: Quantum Dot Heterojunction Solar Cellsmentioning

confidence: 99%

Recent progress on quantum dot solar cells: a review

2016

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Abstract. Semiconductor quantum dots (QDs) have a potential to increase the power conversion efficiency in photovoltaic operation because of the enhancement of photoexcitation. Recent advances in self-assembled QD solar cells (QDSCs) and colloidal QDSCs are reviewed, with a focus on understanding carrier dynamics. For intermediate-band solar cells using selfassembled QDs, suppression of a reduction of open circuit voltage presents challenges for further efficiency improvement. This reduction mechanism is discussed based on recent reports. In QD sensitized cells and QD heterojunction cells using colloidal QDs well-controlled heterointerface and surface passivation are key issues for enhancement of photovoltaic performances. The improved performances of colloidal QDSCs are presented. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Ordered Nanopillar Structured Electrodes for Depleted Bulk Heterojunction Colloidal Quantum Dot Solar Cells

Cited by 124 publications

References 22 publications

Progress and Design Concerns of Nanostructured Solar Energy Harvesting Devices

Progress and Design Concerns of Nanostructured Solar Energy Harvesting Devices

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

Recent progress on quantum dot solar cells: a review

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