0
SOLAR ENERGY R&D IN ASIA

Study on the Change in Photovoltage by Control of Cell Gap in Dye-Sensitized Solar Cells

[+] Author and Article Information
Chaehyeon Lee

Solar Cell Research Center, Materials Science and Technology Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea; Department of Chemistry, Soongsil University, Seoul 156-743, Korea

Weekyung Kang

Department of Chemistry, Soongsil University, Seoul 156-743, Korea

Min Jae Ko

Solar Cell Research Center, Materials Science and Technology Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Korea

Kyoungkon Kim1

Solar Cell Research Center, Materials Science and Technology Division, Korea Institute of Science and Technology (KIST), Seoul 136-791, Koreakimkk@kist.re.kr

Nam-Gyu Park1

School of Chemical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440–746, Koreanpark@kist.re.kr

1

Corresponding authors.

J. Sol. Energy Eng 132(2), 021104 (May 04, 2010) (5 pages) doi:10.1115/1.4001151 History: Received January 14, 2009; Revised July 01, 2009; Published May 04, 2010; Online May 04, 2010

Photo-electrochemical properties of dye-sensitized solar cells (DSSCs) were investigated by changing the gap between working and counter electrodes. The open-circuit voltage (VOC) of DSSCs was significantly increased from 616 mV to 776 mV by about 26% with 1-methyl-3-butyl imidazolium iodide (BMII) based electrolyte and from 428 mV to 513 mV by 20% with lithium iodide (LiI) based electrolyte as the cell gap increased from 16μm to 224μm. From the electrochemical impedance spectroscopy, it was found that the resistance of the electrolyte was increased as the cell gap widened. This resulted in the reduction in the dark current associated with the VOC enhancement. The transient photovoltage spectroscopic measurement confirmed that the time constant for charge recombination between TiO2 and electrolyte became slower as the cell gap of the DSSC with LiI electrolyte increased, which could be an additional reason for the VOC enhancement. The optimal cell gap was determined to be around 31.3μm for the BMII electrolyte system, and around 75.5μm for the LiI electrolyte system in terms of the energy-conversion efficiency.

FIGURES IN THIS ARTICLE
<>
Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

SEM images of the real cell gap between working and counter electrodes sealed by using (a) 25 μm, (b) 60 μm, (c) 120 μm, and (d) 600 μm-thick transparent adhesive polymer (scale bar: 100 μm)

Grahic Jump Location
Figure 2

(a) Current density-voltage characteristics of cell-BMs under 1 sun illumination and in the dark, and (b) cell gap effect on the JSC and VOC of cell-BMs

Grahic Jump Location
Figure 3

(a) Nyquist plots of cell-BMs with four different cell gaps (dot: data point, line: fitted result) and (b) cell gap dependence of the R3

Grahic Jump Location
Figure 4

Recombination lifetime of electrons for the cell-BMs obtained by photovoltage transient measurement

Grahic Jump Location
Figure 5

(a) Current density-voltage characteristics of cell-BMs under 1 sun illumination and in the dark, and (b) cell gap effect on the JSC and VOC of cell-BMs

Grahic Jump Location
Figure 6

Recombination lifetime of electrons for the cell-Lis obtained by photovoltage transient measurement

Grahic Jump Location
Figure 7

(a) Nyquist plots of cell-BMLis with four different cell gaps (dot: data point, line: fitted result) and (b) cell gap dependence of the R3

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In