Quantum efficiencies exceeding unity due to impact ionization in silicon solar cells

Kolodinski, Sabine; Werner, Jürgen; Wittchen, T.; Queisser, H. J.

doi:10.1063/1.110489

Cited by 290 publications

(199 citation statements)

References 11 publications

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“…in semiconductors prevents materials such as Si and GaAs from yielding improved solar conversion efficiencies. 8,9 It has recently been proposed, 10,11 however, that I.I. could be greatly enhanced in semiconductor quantum dots (QDs) (or nanocrystals (NCs)) compared to bulk semiconductors, because the limitations discussed above for I.I.…”

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confidence: 99%

Highly Efficient Multiple Exciton Generation in Colloidal PbSe and PbS Quantum Dots

et al. 2005

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We report ultra-efficient multiple exciton generation (MEG) for single photon absorption in colloidal PbSe and PbS quantum dots (QDs). We employ transient absorption spectroscopy and present measurement data acquired for both intraband as well as interband probe energies. Quantum yields of 300% indicate the creation, on average, of three excitons per absorbed photon for PbSe QDs at photon energies that are four times the QD energy gap. Results indicate that the threshold photon energy for MEG in QDs is twice the lowest exciton absorption energy. We find that the biexciton effect, which shifts the transition energy for absorption of a second photon, influences the early time transient absorption data and may contribute to a modulation observed when probing near the lowest interband transition. We present experimental and theoretical values of the size-dependent interband transition energies for PbSe QDs. We present experimental and theoretical values of the size-dependent interband transition energies for PbSe QDs, and we also introduce a new model for MEG based on the coherent superposition of multiple excitonic states.

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confidence: 99%

Highly Efficient Multiple Exciton Generation in Colloidal PbSe and PbS Quantum Dots

et al. 2005

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“…Another promising type of third-generation solar cells are multiple-exciton-generation solar cells, which enable the conversion of a single highenergy photon to multiple electron-hole pairs by employing semiconductor superlattices or quantum dot semiconductor structures. [26,27] This approach could overcome the central limitation of existing solar cells exhibiting a one-to-one relationship between absorbed photons and electron-hole pairs.…”

Section: Solar Energy Conversionmentioning

confidence: 99%

Functional Materials for Sustainable Energy Technologies: Four Case Studies

Кузнецов

Edwards

2010

ChemSusChem

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The critical topic of energy and the environment has rarely had such a high profile, nor have the associated materials challenges been more exciting. The subject of functional materials for sustainable energy technologies is demanding and recognized as a top priority in providing many of the key underpinning technological solutions for a sustainable energy future. Energy generation, consumption, storage, and supply security will continue to be major drivers for this subject. There exists, in particular, an urgent need for new functional materials for next‐generation energy conversion and storage systems. Many limitations on the performances and costs of these systems are mainly due to the materials′ intrinsic performance. We highlight four areas of activity where functional materials are already a significant element of world‐wide research efforts. These four areas are transparent conducting oxides, solar energy materials for converting solar radiation into electricity and chemical fuels, materials for thermoelectric energy conversion, and hydrogen storage materials. We outline recent advances in the development of these classes of energy materials, major factors limiting their intrinsic functional performance, and potential ways to overcome these limitations.

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“…the minimal photon energy required to realise I.I. ), which is located in the UV part of the solar spectrum for silicon and most other commercially relevant PV materials silicon th ( 3 .4 eV) E = [15]. This high E th has been explained by considering the bulk semiconductor's energy and crystal momentum, both of which must be conserved during the generation of additional charge carriers [36].…”

Section: In Inorganic Bulk Semiconductorsmentioning

confidence: 99%

“…Carrier multiplication (CM) effects, where the energy of a high-energy photon is distributed among multiple carrier pairs with lower energy, present another concept capable of reducing carrier-cooling losses [13][14][15][16]. Here, additional charges are produced from energy that would otherwise have been lost as heat.…”

Section: Introductionmentioning

confidence: 99%

Multiple exciton generation in quantum dot-based solar cells

et al. 2017

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Multiple exciton generation (MEG) in quantumconfined semiconductors is the process by which multiple bound charge-carrier pairs are generated after absorption of a single high-energy photon. Such charge-carrier multiplication effects have been highlighted as particularly beneficial for solar cells where they have the potential to increase the photocurrent significantly. Indeed, recent research efforts have proved that more than one chargecarrier pair per incident solar photon can be extracted in photovoltaic devices incorporating quantum-confined semiconductors. While these proof-of-concept applications underline the potential of MEG in solar cells, the impact of the carrier multiplication effect on the device performance remains rather low. This review covers recent advancements in the understanding and application of MEG as a photocurrent-enhancing mechanism in quantum dot-based photovoltaics.

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Quantum efficiencies exceeding unity due to impact ionization in silicon solar cells

Cited by 290 publications

References 11 publications

Highly Efficient Multiple Exciton Generation in Colloidal PbSe and PbS Quantum Dots

Highly Efficient Multiple Exciton Generation in Colloidal PbSe and PbS Quantum Dots

Functional Materials for Sustainable Energy Technologies: Four Case Studies

Multiple exciton generation in quantum dot-based solar cells

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