Classification of solar cells according to mechanisms of charge separation and charge collection
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Other documents of the author: Kirchartz, Thomas; Bisquert, Juan; Mora-Sero, Ivan; Garcia-Belmonte, Germà
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comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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Title
Classification of solar cells according to mechanisms of charge separation and charge collectionDate
2015Publisher
Royal Society of ChemistryISSN
1463-9076; 1463-9084Type
info:eu-repo/semantics/articlePublisher version
http://pubs.rsc.org/en/content/articlepdf/2015/cp/c4cp05174bVersion
info:eu-repo/semantics/submittedVersionSubject
Abstract
In the last decade, photovoltaics (PV) has experienced an important transformation.
Traditional solar cells formed by compact semiconductor layers have been joined by
new kinds of cells that are constituted by a ... [+]
In the last decade, photovoltaics (PV) has experienced an important transformation.
Traditional solar cells formed by compact semiconductor layers have been joined by
new kinds of cells that are constituted by a complex mixture of organic, inorganic and
solid or liquid electrolyte materials, and rely on charge separation at the nanoscale.
Recently, metal organic halide perovskites have appeared in the photovoltaic landscape
showing large conversion efficiencies, and they may share characteristics of the two
former types. In this paper we provide a general description of the photovoltaic
mechanisms of the single absorber solar cell types, combining all-inorganic and hybrid
and organic cells into a single framework. The operation of the solar cell relies on a
number of internal processes that exploit internal charge separation and overall charge
collection minimizing recombination. There are two main effects to achieve the required
efficiency, first to exploit kinetics at interfaces, favouring the required forward process,
and second to take advantage of internal electrical fields caused by a built-in voltage and
by the distribution of photogenerated charges. These principles represented by selective
contacts, interfaces and the main energy diagram, form a solid base for the discussion of
the operation of future types of solar cells. Additional effects based on ferroelectric
polarization and ionic drift provide interesting prospects for investigating new PV
effects mainly in the perovskite materials. [-]
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Phys. Chem. Chem. Phys., 2015, 17, 4007Rights
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