Effective panchromatic sensitization of electrochemical solar cells

Strategy and organizational rules for spatial separation of complementary light harvesters on high-area photoelectrodes

Nak Cheon Jeong, Ho Jin Son, Chaiya Prasittichai, Chang Yeon Lee, Rebecca A. Jensen, Omar K. Farha, Joseph T Hupp

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Dye-sensitized solar cells, especially those comprising molecular chromophores and inorganic titania, have shown promise as an alternative to silicon for photovoltaic light-to-electrical energy conversion. Co-sensitization (the use of two or more chromophores having complementary absorption spectra) has attracted attention as a method for harvesting photons over a broad spectral range. If implemented successfully, then cosensitization can substantially enhance photocurrent densities and light-to-electrical energy conversion efficiencies. In only a few cases, however, have significant overall improvements been obtained. In most other cases, inefficiencies arise due to unconstructive energy or charge transfer between chromophores or, as we show here, because of modulation of charge-recombination behavior. Spatial isolation of differing chromophores offers a solution. We report a new and versatile method for fabricating two-color photoanodes featuring spatially isolated chromophore types that are selectively positioned in desired zones. Exploiting this methodology, we find that photocurrent densities depend on both the relative and absolute positions of chromophores and on "local" effective electron collection lengths. One version of the two-color photoanode, based on an organic push-pull dye together with a porphyrin dye, yielded high photocurrent densities (JSC = 14.6 mA cm-2) and double the efficiency of randomly mixed dyes, once the dyes were optimally positioned with respect to each other. We believe that the organizational rules and fabrication strategy will prove transferrable, thereby advancing understanding of panchromatic sensitization as well as yielding higher efficiency devices.

Original languageEnglish
Pages (from-to)19820-19827
Number of pages8
JournalJournal of the American Chemical Society
Volume134
Issue number48
DOIs
Publication statusPublished - Dec 5 2012

Fingerprint

Harvesters
Chromophores
Solar cells
Coloring Agents
Light
Dyes
Photocurrents
Energy conversion
Color
Porphyrins
Silicon
Photons
Genetic Recombination
Energy transfer
Conversion efficiency
Charge transfer
Absorption spectra
Electrons
Titanium
Equipment and Supplies

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Effective panchromatic sensitization of electrochemical solar cells : Strategy and organizational rules for spatial separation of complementary light harvesters on high-area photoelectrodes. / Jeong, Nak Cheon; Son, Ho Jin; Prasittichai, Chaiya; Lee, Chang Yeon; Jensen, Rebecca A.; Farha, Omar K.; Hupp, Joseph T.

In: Journal of the American Chemical Society, Vol. 134, No. 48, 05.12.2012, p. 19820-19827.

Research output: Contribution to journalArticle

@article{f2d6fbd495924996a5c93404513fd29f,
title = "Effective panchromatic sensitization of electrochemical solar cells: Strategy and organizational rules for spatial separation of complementary light harvesters on high-area photoelectrodes",
abstract = "Dye-sensitized solar cells, especially those comprising molecular chromophores and inorganic titania, have shown promise as an alternative to silicon for photovoltaic light-to-electrical energy conversion. Co-sensitization (the use of two or more chromophores having complementary absorption spectra) has attracted attention as a method for harvesting photons over a broad spectral range. If implemented successfully, then cosensitization can substantially enhance photocurrent densities and light-to-electrical energy conversion efficiencies. In only a few cases, however, have significant overall improvements been obtained. In most other cases, inefficiencies arise due to unconstructive energy or charge transfer between chromophores or, as we show here, because of modulation of charge-recombination behavior. Spatial isolation of differing chromophores offers a solution. We report a new and versatile method for fabricating two-color photoanodes featuring spatially isolated chromophore types that are selectively positioned in desired zones. Exploiting this methodology, we find that photocurrent densities depend on both the relative and absolute positions of chromophores and on {"}local{"} effective electron collection lengths. One version of the two-color photoanode, based on an organic push-pull dye together with a porphyrin dye, yielded high photocurrent densities (JSC = 14.6 mA cm-2) and double the efficiency of randomly mixed dyes, once the dyes were optimally positioned with respect to each other. We believe that the organizational rules and fabrication strategy will prove transferrable, thereby advancing understanding of panchromatic sensitization as well as yielding higher efficiency devices.",
author = "Jeong, {Nak Cheon} and Son, {Ho Jin} and Chaiya Prasittichai and Lee, {Chang Yeon} and Jensen, {Rebecca A.} and Farha, {Omar K.} and Hupp, {Joseph T}",
year = "2012",
month = "12",
day = "5",
doi = "10.1021/ja308725r",
language = "English",
volume = "134",
pages = "19820--19827",
journal = "Journal of the American Chemical Society",
issn = "0002-7863",
publisher = "American Chemical Society",
number = "48",

}

TY - JOUR

T1 - Effective panchromatic sensitization of electrochemical solar cells

T2 - Strategy and organizational rules for spatial separation of complementary light harvesters on high-area photoelectrodes

AU - Jeong, Nak Cheon

AU - Son, Ho Jin

AU - Prasittichai, Chaiya

AU - Lee, Chang Yeon

AU - Jensen, Rebecca A.

AU - Farha, Omar K.

AU - Hupp, Joseph T

PY - 2012/12/5

Y1 - 2012/12/5

N2 - Dye-sensitized solar cells, especially those comprising molecular chromophores and inorganic titania, have shown promise as an alternative to silicon for photovoltaic light-to-electrical energy conversion. Co-sensitization (the use of two or more chromophores having complementary absorption spectra) has attracted attention as a method for harvesting photons over a broad spectral range. If implemented successfully, then cosensitization can substantially enhance photocurrent densities and light-to-electrical energy conversion efficiencies. In only a few cases, however, have significant overall improvements been obtained. In most other cases, inefficiencies arise due to unconstructive energy or charge transfer between chromophores or, as we show here, because of modulation of charge-recombination behavior. Spatial isolation of differing chromophores offers a solution. We report a new and versatile method for fabricating two-color photoanodes featuring spatially isolated chromophore types that are selectively positioned in desired zones. Exploiting this methodology, we find that photocurrent densities depend on both the relative and absolute positions of chromophores and on "local" effective electron collection lengths. One version of the two-color photoanode, based on an organic push-pull dye together with a porphyrin dye, yielded high photocurrent densities (JSC = 14.6 mA cm-2) and double the efficiency of randomly mixed dyes, once the dyes were optimally positioned with respect to each other. We believe that the organizational rules and fabrication strategy will prove transferrable, thereby advancing understanding of panchromatic sensitization as well as yielding higher efficiency devices.

AB - Dye-sensitized solar cells, especially those comprising molecular chromophores and inorganic titania, have shown promise as an alternative to silicon for photovoltaic light-to-electrical energy conversion. Co-sensitization (the use of two or more chromophores having complementary absorption spectra) has attracted attention as a method for harvesting photons over a broad spectral range. If implemented successfully, then cosensitization can substantially enhance photocurrent densities and light-to-electrical energy conversion efficiencies. In only a few cases, however, have significant overall improvements been obtained. In most other cases, inefficiencies arise due to unconstructive energy or charge transfer between chromophores or, as we show here, because of modulation of charge-recombination behavior. Spatial isolation of differing chromophores offers a solution. We report a new and versatile method for fabricating two-color photoanodes featuring spatially isolated chromophore types that are selectively positioned in desired zones. Exploiting this methodology, we find that photocurrent densities depend on both the relative and absolute positions of chromophores and on "local" effective electron collection lengths. One version of the two-color photoanode, based on an organic push-pull dye together with a porphyrin dye, yielded high photocurrent densities (JSC = 14.6 mA cm-2) and double the efficiency of randomly mixed dyes, once the dyes were optimally positioned with respect to each other. We believe that the organizational rules and fabrication strategy will prove transferrable, thereby advancing understanding of panchromatic sensitization as well as yielding higher efficiency devices.

UR - http://www.scopus.com/inward/record.url?scp=84870698595&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84870698595&partnerID=8YFLogxK

U2 - 10.1021/ja308725r

DO - 10.1021/ja308725r

M3 - Article

VL - 134

SP - 19820

EP - 19827

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

SN - 0002-7863

IS - 48

ER -