Comprehensive control of voltage loss enables 11.7% efficient solid-state dye-sensitized solar cells.
Result description
The relatively large voltage loss (V-loss) in excitonic type solar cells severely limits their power conversion efficiencies (PCEs). Here, we report a comprehensive control of V-loss through efficacious engineering of the sensitizer and redox mediator, making a breakthrough in the PCE of dye-sensitized solar cells (DSSCs). The targeted down-regulation of V-loss is successfully realized by three valid channels: (i) reducing the driving force of electron injection through dye molecular engineering, (ii) decreasing the dye regeneration overpotential through redox mediator engineering, and (iii) suppressing interfacial electron recombination. Significantly, the `` trade-off'' effect between the dye optical band gap and the open-circuit voltage (V-OC) is minimized to a great extent, achieving a distinct enhancement in photovoltaic performance (PCE > 11.5% with V-OC up to 1.1 V) for liquid junction cells. The solidification of the best-performing device leads to a PCE of 11.7%, which is so far the highest efficiency obtained for solid-state DSSCs. Our work inspires further development in highly efficient excitonic solar cells by comprehensive control of V-loss.
Keywords
highly efficientday-senzitized solar cellsEconomic and social effects
The result's identifiers
Result code in IS VaVaI
Result on the web
DOI - Digital Object Identifier
Alternative languages
Result language
angličtina
Original language name
Comprehensive control of voltage loss enables 11.7% efficient solid-state dye-sensitized solar cells.
Original language description
The relatively large voltage loss (V-loss) in excitonic type solar cells severely limits their power conversion efficiencies (PCEs). Here, we report a comprehensive control of V-loss through efficacious engineering of the sensitizer and redox mediator, making a breakthrough in the PCE of dye-sensitized solar cells (DSSCs). The targeted down-regulation of V-loss is successfully realized by three valid channels: (i) reducing the driving force of electron injection through dye molecular engineering, (ii) decreasing the dye regeneration overpotential through redox mediator engineering, and (iii) suppressing interfacial electron recombination. Significantly, the `` trade-off'' effect between the dye optical band gap and the open-circuit voltage (V-OC) is minimized to a great extent, achieving a distinct enhancement in photovoltaic performance (PCE > 11.5% with V-OC up to 1.1 V) for liquid junction cells. The solidification of the best-performing device leads to a PCE of 11.7%, which is so far the highest efficiency obtained for solid-state DSSCs. Our work inspires further development in highly efficient excitonic solar cells by comprehensive control of V-loss.
Czech name
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Czech description
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Classification
Type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Result continuities
Project
GA13-07724S: Materials engineering towards Innovative Graetzel solar cells
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Energy & Environmental Science
ISSN
1754-5692
e-ISSN
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Volume of the periodical
11
Issue of the periodical within the volume
7
Country of publishing house
GB - UNITED KINGDOM
Number of pages
9
Pages from-to
1779-1787
UT code for WoS article
000438392400013
EID of the result in the Scopus database
2-s2.0-85050134931
Basic information
Result type
Jimp - Article in a specialist periodical, which is included in the Web of Science database
OECD FORD
Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Year of implementation
2018