Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO<sub>2</sub> Photoanode

Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO<sub>2</sub> Photoanode

By simple soaking titanium dioxide (TiO<sub>2</sub>) films in an aqueous Na<sub>2</sub>S solution, we could prepare surface-modified photoanodes for application to dye-sensitized solar cells (DSSCs). An improvement in both the open-circuit voltage (<i>V<sub>oc<...

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Main Authors: Hye Kyeong Sung, Yeonju Lee, Wook Hyun Kim, Sang-Ju Lee, Shi-Joon Sung, Dae-Hwan Kim, Yoon Soo Han
Format: Article
Language:English
Published: MDPI AG 2020-03-01
Series:Molecules
Subjects:
sodium sulfide
dye-sensitized solar cell
conduction band edge shift
surface modification
Online Access:https://www.mdpi.com/1420-3049/25/7/1502
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spelling doaj-62c95ec23221495aa52543cbe1d142b92020-11-25T01:28:24ZengMDPI AGMolecules1420-30492020-03-01257150210.3390/molecules25071502molecules25071502Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO<sub>2</sub> PhotoanodeHye Kyeong Sung0Yeonju Lee1Wook Hyun Kim2Sang-Ju Lee3Shi-Joon Sung4Dae-Hwan Kim5Yoon Soo Han6Department of Organic Material Science and Engineering, Pusan National University, Busan 46241, KoreaSchool of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongbuk 38430, KoreaDivision of Energy Technology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, KoreaDivision of Energy Technology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, KoreaDivision of Energy Technology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, KoreaDivision of Energy Technology, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, KoreaSchool of Advanced Materials and Chemical Engineering, Daegu Catholic University, Gyeongbuk 38430, KoreaBy simple soaking titanium dioxide (TiO<sub>2</sub>) films in an aqueous Na<sub>2</sub>S solution, we could prepare surface-modified photoanodes for application to dye-sensitized solar cells (DSSCs). An improvement in both the open-circuit voltage (<i>V<sub>oc</sub></i>) and the fill factor (<i>FF</i>) was observed in the DSSC with the 5 min-soaked photoanode, compared with those of the control cell without any modification. The UV&#8722;visible absorbance spectra, UPS valence band spectra, and dark current measurements revealed that the Na<sub>2</sub>S modification led to the formation of anions on the TiO<sub>2</sub> surface, and thereby shifted the conduction band edge of TiO<sub>2</sub> in the negative (upward) direction, inducing an increase of 29 mV in the <i>V<sub>oc</sub></i>. It was also found that the increased <i>FF</i> value in the surface-treated device was attributed to an elevation in the shunt resistance.https://www.mdpi.com/1420-3049/25/7/1502sodium sulfidedye-sensitized solar cellconduction band edge shiftsurface modification
collection DOAJ
language English
format Article
sources DOAJ
author Hye Kyeong Sung
Yeonju Lee
Wook Hyun Kim
Sang-Ju Lee
Shi-Joon Sung
Dae-Hwan Kim
Yoon Soo Han
spellingShingle Hye Kyeong Sung
Yeonju Lee
Wook Hyun Kim
Sang-Ju Lee
Shi-Joon Sung
Dae-Hwan Kim
Yoon Soo Han
Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO<sub>2</sub> Photoanode
Molecules
sodium sulfide
dye-sensitized solar cell
conduction band edge shift
surface modification
author_facet Hye Kyeong Sung
Yeonju Lee
Wook Hyun Kim
Sang-Ju Lee
Shi-Joon Sung
Dae-Hwan Kim
Yoon Soo Han
author_sort Hye Kyeong Sung
title Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO<sub>2</sub> Photoanode
title_short Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO<sub>2</sub> Photoanode
title_full Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO<sub>2</sub> Photoanode
title_fullStr Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO<sub>2</sub> Photoanode
title_full_unstemmed Enhanced Power Conversion Efficiency of Dye-Sensitized Solar Cells by Band Edge Shift of TiO<sub>2</sub> Photoanode
title_sort enhanced power conversion efficiency of dye-sensitized solar cells by band edge shift of tio<sub>2</sub> photoanode
publisher MDPI AG
series Molecules
issn 1420-3049
publishDate 2020-03-01
description By simple soaking titanium dioxide (TiO<sub>2</sub>) films in an aqueous Na<sub>2</sub>S solution, we could prepare surface-modified photoanodes for application to dye-sensitized solar cells (DSSCs). An improvement in both the open-circuit voltage (<i>V<sub>oc</sub></i>) and the fill factor (<i>FF</i>) was observed in the DSSC with the 5 min-soaked photoanode, compared with those of the control cell without any modification. The UV&#8722;visible absorbance spectra, UPS valence band spectra, and dark current measurements revealed that the Na<sub>2</sub>S modification led to the formation of anions on the TiO<sub>2</sub> surface, and thereby shifted the conduction band edge of TiO<sub>2</sub> in the negative (upward) direction, inducing an increase of 29 mV in the <i>V<sub>oc</sub></i>. It was also found that the increased <i>FF</i> value in the surface-treated device was attributed to an elevation in the shunt resistance.
topic sodium sulfide
dye-sensitized solar cell
conduction band edge shift
surface modification
url https://www.mdpi.com/1420-3049/25/7/1502
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AT wookhyunkim enhancedpowerconversionefficiencyofdyesensitizedsolarcellsbybandedgeshiftoftiosub2subphotoanode
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