Raising efficiency of organic solar cells with electrotropic additives

Karak, Supravat; Page, Zachariah A.; Tinkham, Jonathan S.; Lahti, Paul M.; Emrick, Todd; Duzhko, Volodimyr V.

doi:10.1063/1.4914847

Cited by 30 publications

(15 citation statements)

References 35 publications

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“…Therefore, energy generation focus has been shifted more towards alternative renewable energy sources. During the last 12 years, enormous work is being pursued on silicon solar cell, perovskite solar cell, organic solar cell, thermoelectric materials and production of hydrogen for fuel cell [2][3][4][5][6][7][8][9]. The share of renewable energy in a global electricity generation approached 22.8% in 2014, making them the third largest contributor just behind coal and gas [10].…”

Section: Introductionmentioning

confidence: 99%

Green hydroelectrical energy source based on water dissociation by nanoporous ferrite

Kotnala

Shah

2016

Int. J. Energy Res.

109

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Summary Dissociation of water molecule occurs on octahedrally coordinated unsaturated suface cations and oxygen vacancies created by lithium substitution in magnesium ferrite. Lower synthesis temperature of ferrite has generated nanopores in microstructure. Dissociated hydronium and hydroxyl ions are transported through surface and capillary diffusion in porous ferrite network towards attached Zn and Ag electrodes. Water molecule dissociation ability of nanoporous ferrite has been exploited to develop a green electrical energy cell, which is a combination of material science and electrode chemistry. The innovated cell has been nomenclatured as hydroelectric cell (HEC). When HEC is partially dipped in deionized water, spontaneously hydroxide and hydronium ions are produced by water molecule dissociation. Hydronium ions trapped in nanopores develop enough electric field that further dissociates physisorbed water molecules. Thereby, the process of water molecule dissociation is accelerated in a bigger way to increase ionic current in the cell. Oxidation of Zn electrode by hydroxide ion and reduction of H3O+ at Ag electrode develop voltage and electric current in the cell. The HEC cell of a 17 cm2 area is able to generate a short circuit current of 82 mA and 920 mV emf with a maximum output power of 74 mW, which is three order higher than reported output power 1.4 μW/cm2 produced by water in cement matrix. Hydroelectric cell performance is repetitive, stable and possesses potential to replace traditional ways of generating renewable energy in terms of cost and safety. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Introductionmentioning

confidence: 99%

Green hydroelectrical energy source based on water dissociation by nanoporous ferrite

Kotnala

Shah

2016

Int. J. Energy Res.

109

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“…This is also seen in the individual EPR spectra of C 60 -N and C 70 -N ( Figure S7A,C ) and is consistent with a molecular dipole oriented from the fullerene cage to the tertiary amines. 48 , 49 Interestingly, the EPR signal intensified when irradiated with white light (70 mW cm –2 ), indicative of photoenhanced self-doping ( Figure 3 C, Figure S7A,C ). Current – voltage ( I – V ) measurements confirmed that photocurrent within the C 60 /C 70 -N thin films is nearly 1 order of magnitude larger than in the dark ( Figure 3 D).…”

Section: Resultsmentioning

confidence: 99%

Chemical Stabilization of Perovskite Solar Cells with Functional Fulleropyrrolidines

et al. 2017

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While perovskite solar cells have invigorated the photovoltaic research community due to their excellent power conversion efficiencies (PCEs), these devices notably suffer from poor stability. To address this crucial issue, a solution-processable organic chemical inhibition layer (OCIL) was integrated into perovskite solar cells, resulting in improved device stability and a maximum PCE of 16.3%. Photoenhanced self-doping of the fulleropyrrolidine mixture in the interlayers afforded devices that were advantageously insensitive to OCIL thickness, ranging from 4 to 190 nm. X-ray photoelectron spectroscopy (XPS) indicated that the fulleropyrrolidine mixture improved device stability by stabilizing the metal electrode and trapping ionic defects (i.e., I–) that originate from the perovskite active layer. Moreover, degraded devices were rejuvenated by repeatedly peeling away and replacing the OCIL/Ag electrode, and this repeel and replace process resulted in further improvement to device stability with minimal variation of device efficiency.

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“…An effective approach to suppress the diffusion loss in OSCs is to increase the built-in electric field across the active layer. 18 This can be realized by using a high-work function material as the anode and a low-work function material as the cathode. 19 For this purpose, doped materials, such as ZnO, 20,21 MoO 3 , 22,23 or PEDOT:PSS, 24,25 with the desired work function are often used as the interlayer to transport electrons or holes from the active layer to the electrode.…”

Section: ■ Introductionmentioning

confidence: 99%

Effective Strategy to Improve Contact Selectivity in Organic Solar Cells

Jin

et al. 2021

ACS Appl. Energy Mater.

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Improving the contact selectivity is an effective approach to reduce the non-radiative recombination voltage loss caused by charge carrier diffusion in organic solar cells. A surface modification strategy based on the use of the fullerene-selective solvent 1,8-diiodooctane (DIO) is proposed to improve the contact selectivity of organic solar cells. We observe that the fullerene molecules in the binary polymer− fullerene active layers or the ternary active layers containing both fullerene and nonfullerene acceptors are extracted to the surface after the DIO treatment. As a result, a dense fullerene layer, highly selective for electrons, is created at the cathode interface of the solar cell. The increased cathode selectivity gives rise to reduced diffusion loss of charge carriers, suppressed non-radiative recombination voltage loss, increased opencircuit voltage, and thus, the improved photovoltaic performance of the solar cell.

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Raising efficiency of organic solar cells with electrotropic additives

Cited by 30 publications

References 35 publications

Green hydroelectrical energy source based on water dissociation by nanoporous ferrite

Green hydroelectrical energy source based on water dissociation by nanoporous ferrite

Chemical Stabilization of Perovskite Solar Cells with Functional Fulleropyrrolidines

Effective Strategy to Improve Contact Selectivity in Organic Solar Cells

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