Effect of Aspect Ratio of the Dye Molecule on the Properties of Dye Sensitized Solar Cells†

doi:10.7503/cjcu20160302

Abstract

Abstract:

Three dyes, 2-cyano-3-[2-(4-{2-[4-N,N-bis(4-methylphenyl)aminophenyl]vinyl}-phenylamino)-pyrimidin-5-yl]-acrylic acid(MTPA-Pyc), 2-cyano-3-(4-{2-[4-N,N-bis(4-methylphenyl)aminophenyl]vinyl}-phenyl)-acrylic acid(MTPAcc), and 2-cyano-3-[4-N,N-bis(4-methylphenyl)aminophenyl]-acrylic acid(MTPAc), that have different aspect ratios were studied for their performances as sensitizer in a dye sensitized solar cell(DSSC). The effects of solvent, the amount of dye molecules adsorbed on the surface of TiO₂, and dye aggregation were investigated. The results show that MTPAcc has the most suitable aspect ratio among the three dyes with the highest and best photovoltaic properties. Polariry of absorption solvents can influence not only the absorbed amount of dyes at TiO₂ but also the dye aggregation. MTPA-Pyc with a large aspect ratio exists in H-aggregation in tolene and tetrahydrofuran, whereas J-aggregation in acetonitrile. MTPAcc was found with high absorption amount at TiO₂ but without aggregation, resulting in the best photovoltaic properties of corresponding DSSC with the incident photon-to-current efficiency(IPCE) of 84% at 490 nm and the photoelectric conversion efficiency(η) of 5.72%. Therefore, the aspect ratio of dye sensitizers is significant for the photovoltaic properties of DSSC.

Key words: Dye sensitized solar cell, Aspect ratio, Absorbed amount, Aggregation

CLC Number:

O646
O621.2

TrendMD:

REN Siyao, ZHOU Xueqin, LIU Dongzhi, JIANG Kejian, LI Wei, WANG Lichang, WANG Tianyang. Effect of Aspect Ratio of the Dye Molecule on the Properties of Dye Sensitized Solar Cells^†[J]. Chem. J. Chinese Universities, 2016, 37(9): 1669.

Figures/Tables 9

Fig.1 Chemical structures of MTPA-Pyc, MTPAcc and MTPAc

Table 1 Absorbed amount(mol/cm2) of the anchored dyes on TiO2 films in differernt solvents

Dye	Solvent
Dye	THF	MeCN	Toluene
MTPA-Pyc	3.58×10^-7	3.78×10^-7	3.22×10^-7
MTPAcc	4.20×10^-7	7.28×10^-7	4.15×10^-7
MTPAc	1.53×10^-7	1.91×10^-7	1.26×10^-7

Fig.2 Normalized UV-Vis absorption spectra of the dyes in THF(3×10-6 mol/L)(A) and on TiO2 films(sample 1)(B) ε: Molar extinction coefficient at maximum absorption wavelength. a. MTPA-Pyc(ε=36500 L·mol-1·cm-1); b. MTPAcc(ε=37000 L·mol-1·cm-1); c. MTPAc(ε=37500 L·mol-1·cm-1).

Fig.3 Normalized UV-Vis absorption spectra of the dyes in MeCN(3×10-6 mol/L)(A) and on TiO2 films(sample 1)(B) a. MTPA-Pyc(ε=13833 L·mol-1·cm-1); b. MTPAcc(ε=30667 L·mol-1·cm-1); c. MTPAc(ε=36733 L·mol-1·cm-1).

Fig.4 Normalized UV-Vis absorption spectra of the dyes in toluene(3×10-6 mol/L)(A) and on TiO2 films(sample 1)(B) a. MTPA-Pyc(ε=33187 L·mol-1·cm-1); b. MTPAcc(ε=35116 L·mol-1·cm-1); c. MTPAc(ε=30000 L·mol-1·cm-1).

Fig.5 IPCE spectra(A) and J-V curves(B) of DSSCs sensitized in THF a. MTPA-Pyc; b. MTPAcc; c. MTPAc.

Table 2 Photovoltaic performance of DSSCs via differernt solutions

Dye	Solvent	J_sc/(mA·cm^-2)	V_oc/V	FF	η(%)
MTPA-Pyc	THF	9.60	0.71	0.71	4.84
	MeCN	7.27	0.67	0.68	3.31
	Toluene	8.98	0.69	0.68	4.21
MTPAcc	THF	11.52	0.71	0.70	5.72
	MeCN	8.53	0.67	0.68	3.89
	Toluene	10.31	0.71	0.70	5.12
MTPAc	THF	7.71	0.67	0.66	3.41
	MeCN	6.44	0.65	0.62	2.59
	Toluene	7.10	0.68	0.69	3.33

Fig.6 IPCE spectra(A) and J-V curves(B) of DSSCs sensitized in MeCN a. MTPA-Pyc; b. MTPAcc; c. MTPAc.

Fig.7 IPCE spectra(A) and J-V curves(B) of DSSCs sensitized in toluene a. MTPA-Pyc; b. MTPAcc; c. MTPAc.

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