Efficient organic solar cells by penetration of conjugated polymers into perylene pigments

Nakamura, Jun-ichi; Yokoe, Chiho; Murata, Katsuyuki; Takahashi, Kohshin

doi:10.1063/1.1804245

Cited by 36 publications

(26 citation statements)

References 31 publications

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“…6,7 One notices that the efficiency decreases when LUMO p increases (i.e. the bandgap of the absorber increases), because less photons are being absorbed.…”

Section: Single Junction Organic Solar Cellmentioning

confidence: 99%

Efficiency potential of organic bulk heterojunction solar cells

Minnaert

Burgelman

2007

Progress in Photovoltaics

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In order for organic bulk heterojunction solar cells to compete with the traditional inorganic cells, power conversion efficiencies of more than 10% are desirable. Nowadays, efficiencies up to 5% are reached and the question about the limits for the attainable efficiency of organic cells arises. In this paper, we study the efficiency potential of organic bulk heterojunction solar cells. We make realistic assumptions to predict efficiencies obtainable in the near future, and calculate the upper-limit. We study the influence of the difference between the lowest unoccupied molecular orbital (LUMO)-energy levels of donor and acceptor, and the absorption window on the efficiency. Ideal material characteristics are obtained from these calculations, giving an idea how the ideal organic solar cell should look like. The calculations show that nowadays an efficiency of 5Á8% for the single junction bulk heterojunction solar cell should be possible. Considering parameters which are credible to be achieved in the future, an organic solar cell of 15Á2% is in reach, with an optimal bandgap of 1Á5 eV for the absorber. We also consider the situation where both the nand p-type materials are absorbers. All calculations are not only done for a single junction cell, but also for tandem solar cells. For a tandem structure of organic cells, we find in a realistic scenario a maximum attainable efficiency of 10Á1% and an efficiency of 23Á2% in an optimistic scenario with optimal bandgaps E g1 ¼ 1Á7 eV and E g2 ¼ 1Á1 eV.

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“…6,7 One notices that the efficiency decreases when LUMO p increases (i.e. the bandgap of the absorber increases), because less photons are being absorbed.…”

Section: Single Junction Organic Solar Cellmentioning

confidence: 99%

Efficiency potential of organic bulk heterojunction solar cells

Minnaert

Burgelman

2007

Progress in Photovoltaics

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“…[7][8][9][10][11] For example, we reported that the ITO/amorphous TiO x / PCBM:P3HT/PEDOT:PSS/Au inverted type cell showed the power conversion efficiency of 2.47% and the performance of the cells with sealing was about the same after continuous light irradiating for 120 h in an ambient atmosphere. 12 Even without sealing, this solar cell maintained the performance after continuous light irradiation for 20 h. Thus, we have the techniques required to fabricate the organic thin-film solar cells with reasonable performance and stability.…”

Section: Introductionmentioning

confidence: 99%

Characterization of ZnS-layer-inserted bulk-heterojunction organic solar cells by ac impedance spectroscopy

Kawamata

Nakamoto

Kawahara

et al. 2009

Journal of Applied Physics

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A fluorine-doped tin oxide ͑FTO͒/zinc sulfide ͑ZnS͒/͓6,6͔-phenyl C 61 butyric acid methyl ester ͑PCBM͒: regioregular poly͑3-hexylthiophene͒ ͑P3HT͒/poly͑3,4-ethylenedioxylenethiophene͒: poly͑4-styrene sulfonic acid͒ ͑PEDOT:PSS͒/Au type organic solar cell ͑FTO/ZnS/PCBM:P3HT/ PEDOT:PSS/Au, ZnS cell͒ with a 1 cm 2 active area was first developed using transparent ZnS prepared on a FTO electrode by a chemical bath deposition method. The ZnS inserted solar cells were investigated by photocurrent-voltage ͑I-V͒ and ac impedance spectroscopy ͑IS͒ measurements. In photo I-V measurements, the ZnS cell exhibited scattered power conversion efficiencies ͑͒ of 0.7%-1.2% when the FTO/ZnS electrode was not immersed in various aqueous solutions before the fabrication of the ZnS cells. In contrast, the solar cells with a surface-modified FTO/ZnS electrode by immersing in 0.1M Na 2 S solutions at pH 7-9 containing hydrosulfide ions ͑HS − ͒ exhibited reproducible of 1.5%-1.7%. The electric resistance components in the cell consisting of five layers were separately estimated by the IS measurement. The larger of the solar cell using HS − modified ZnS was explained by the fact that the charge transport resistance at the ZnS/PCBM:P3HT interface became smaller due to this surface modification. When a continuous light irradiation was carried out for the modified cells, the resistance at the ZnS/PCBM:P3HT interface increased, being accompanied by the decrease in the . That is, the cell performance was controlled mainly by charge transport velocity at the ZnS/PCBM:P3HT interface.

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“…In our previous research, we have developed organic thin film solar cells using a non-corrosive Au metal as the back electrode, and an ITO/In or a transparent conducting oxide (TCO)/TiO 2 as the front electrode [16][17][18][19]. We reported that the ITO/In/perylene tetracarboxylic derivative/poly(phenylenevinylene) derivative/PEDOT:PSS/Au two-layer type cell showed the power conversion efficiency of 1.9 % and its performance was about the same after irradiating for 1 h in an ambient atmosphere [20]. Thus, we have reported previously that an organic solar cell using a …”

Section: Introductionmentioning

confidence: 99%

Highly durable inverted-type organic solar cell using amorphous titanium oxide as electron collection electrode inserted between ITO and organic layer

Kawamata

Nakayama

Uozumi

et al. 2008

Solar Energy Materials and Solar Cells

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165

134

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An indium tin oxide/titanium oxide/[6,6]-phenyl C 61 butyric acid methyl ester: regioregular poly(3-hexylthiophene)/poly(3,4-ethylenedioxylenethiophene): poly(4-styrene sulfonic acid)/Au type organic solar cell (ITO/TiO x /PCBM:P3HT/PEDOT:PSS/Au) with 1 cm 2 active area, which is called "inverted type solar cell", was developed using an ITO/amorphous titanium oxide (TiO x ) electrode prepared by a sol-gel technique instead of the low functional electrode such as Al. The power conversion efficiency (η) of 2.47 % was obtained by irradiating AM 1.5G-100 mW cm -2 simulated sunlight. We found that a photoconduction of TiO x by irradiating UV light containing slightly into the simulated sunlight was required to drive this solar cell. The device durability in an ambient atmosphere was maintained for more than 20 h under continuous light irradiation. Further, when the air-stable device was covered by a glass plate with water getter sheet which was coated by an epoxy UV resin as sealing material, the durability was still higher and over 96 % of relative efficiency was observed even after continuous light irradiation for 120 h.

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Efficient organic solar cells by penetration of conjugated polymers into perylene pigments

Cited by 36 publications

References 31 publications

Efficiency potential of organic bulk heterojunction solar cells

Efficiency potential of organic bulk heterojunction solar cells

Characterization of ZnS-layer-inserted bulk-heterojunction organic solar cells by ac impedance spectroscopy

Highly durable inverted-type organic solar cell using amorphous titanium oxide as electron collection electrode inserted between ITO and organic layer

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