Benzothiadiazole Substituted Semiconductor Molecules for Organic Solar Cells: The Effect of the Solvent Annealing Over the Thin Film Hole Mobility Values

Rodríguez‐Seco, Cristina; Biswas, Shyamal; Sharma, Ganesh D.; Vidal‐Ferran, Anton; Palomares, Emilio

doi:10.1021/acs.jpcc.8b00840

Cited by 15 publications

(22 citation statements)

References 42 publications

(52 reference statements)

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“…Solvent annealing has been observed to have a positive effect on improving the mobility. In a study on a blend of benzothiadiazole based molecule and PC 71 BM as active layer annealed by carbon disulphide an improvement in hole mobility and the power conversion efficiency is achieved [ 105 ]. A small molecule device based on BIT4FSe:PC 71 BM annealed by Ch 2 Cl 2 showed a significant increase in hole mobility and a slight increase in electron mobility [ 106 ].…”

Section: Charge Carrier Mobilitiesmentioning

confidence: 99%

Organic Solar Cells Parameters Extraction and Characterization Techniques

et al. 2021

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Organic photovoltaic research is continuing in order to improve the efficiency and stability of the products. Organic devices have recently demonstrated excellent efficiency, bringing them closer to the market. Understanding the relationship between the microscopic parameters of the device and the conditions under which it is prepared and operated is essential for improving performance at the device level. This review paper emphasizes the importance of the parameter extraction stage for organic solar cell investigations by offering various device models and extraction methodologies. In order to link qualitative experimental measurements to quantitative microscopic device parameters with a minimum number of experimental setups, parameter extraction is a valuable step. The number of experimental setups directly impacts the pace and cost of development. Several experimental and material processing procedures, including the use of additives, annealing, and polymer chain engineering, are discussed in terms of their impact on the parameters of organic solar cells. Various analytical, numerical, hybrid, and optimization methods were introduced for parameter extraction based on single, multiple diodes and drift-diffusion models. Their validity for organic devices was tested by extracting the parameters of some available devices from the literature.

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Section: Charge Carrier Mobilitiesmentioning

confidence: 99%

Organic Solar Cells Parameters Extraction and Characterization Techniques

et al. 2021

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Section: Introductionmentioning

confidence: 99%

“…Currently, several processing methods have been proposed such as thermal/solvent annealing and adding solvent additives to adjust and optimize the nanoscale morphology of BHJ films. [7,8] Solvent additives strategy has been recognized as the most commonly used and useful method to regulate the domains of active layer films for the OSCs based on either fullerene or non-fullerene acceptors. The solvent additives like 1-chloronaphthalene (CN), 1,8-diiodooctane (DIO) and octanedithiol (ODT) have shown distinct effect on promoting the performance of OSCs.…”

Section: Introductionmentioning

confidence: 99%

Adjusting the Active Layer Morphology via an Amorphous Acceptor Solid Additive for Efficient and Stable Nonfullerene Organic Solar Cells

You

Zhou

et al. 2021

Solar RRL

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It is incredibly feasible and effective to adopt a solid additive strategy to optimize the active layer blend films morphology for nonfullerene organic solar cells (OSCs) to achieve high efficiency and stable performance. Herein, a novel amorphous small molecule SJ‐IC‐M with a comparatively high molecular weight is first designed and used as an efficient solid additive in the OSCs based on PM6:Y6 to enhance the power conversion efficiency (PCE) and long‐term stability of the device. After the addition of 0.5 wt% SJ‐IC‐M into the active layer blends, the PCE can be increased to 16.2% compared with that of the reference device without additive displaying an inferior PCE of 15.0%. Moreover, the device containing the SJ‐IC‐M additive delivers more excellent long‐term stability. The PCE can remain over 90% of its initial value when the unencapsulated device is preserved in a N2‐filled glovebox for a month. Systematic analysis reveals that the introduction of the relatively high molecular weight amorphous SJ‐IC‐M additive can optimize the crystallinity of Y6. As a result, an improved charge transport, stabilized blend morphology, and enhanced device performance are achieved. Moreover, the current research provides a new strategy which can replace the commonly used solvent additive to fabricate efficient and stable nonfullerene OSCs.

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“…The TOH combines the advantages of PC 71 BM (high electron mobility) and DPP8 (complementary and strong absorption beyond 650–950 nm, where the CS03:PC 71 BM blend showed weak absorption). After the optimization of TOH, i.e., solvent vapor treatment, the OSC showed overall PCE of 8.94%, which is higher than that for binary organic heterojunctions (BHJs) consisting of a blend of CS03, with each individual electron acceptor being 7.44% and 5.07% for CS03:DPP8 and CS03:PC 71 BM, respectively. This enhancement is related to the wider absorption profile of TOH, improved energy levels alignment, and better balance charge transport between holes and electrons.…”

Section: Introductionmentioning

confidence: 99%

Efficient Non-polymeric Heterojunctions in Ternary Organic Solar Cells

Rodríguez‐Seco

Vidal‐Ferran

Misra

et al. 2018

ACS Appl. Energy Mater.

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We describe the use of a near IR non-fullerene low molecular weight organic semiconductor molecule, as electron acceptor, in combination with a wide band gap organic semiconductor electron donor, in efficient bulk heterojunction organic solar cells. The electron acceptor is a 2,5-dihydropyrrolo-[3,4-c]pyrrole-1,4-dione-based molecule while the electron donor is a carbazole derivative. These two small molecules have complementary absorption spectra, and, thus, the heterojunction absorbs from 450 to 950 nm. The optimized photoactive layer shows power conversion efficiency of 7.44% under standard measurement conditions with an estimated energy loss as low as 0.55 eV. Identical solar cells, but using fullerene derivative, PC 71 BM, result in lower efficiency values (PCE = 5.07%) and greater energy losses (0.86 eV). The better performance of the non-fullerene-based small molecule organic solar cells is due to the higher LUMO energy level for the electron acceptor. Moreover, to improve further the efficiency of the solar cell, we carried out the study of mixing both the electron acceptor and the electron donor. The ternary organic heterojunction formed results in panchromatic absorption spectra. The overall efficiency of the organic solar cell based on solvent vapor treated ternary active layer showed power conversion efficiency of 8.94% due to the efficient light harvesting, improved energy levels alignment, and better charge balance of electronic holes and electrons.

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Benzothiadiazole Substituted Semiconductor Molecules for Organic Solar Cells: The Effect of the Solvent Annealing Over the Thin Film Hole Mobility Values

Cited by 15 publications

References 42 publications

Organic Solar Cells Parameters Extraction and Characterization Techniques

Organic Solar Cells Parameters Extraction and Characterization Techniques

Adjusting the Active Layer Morphology via an Amorphous Acceptor Solid Additive for Efficient and Stable Nonfullerene Organic Solar Cells

Efficient Non-polymeric Heterojunctions in Ternary Organic Solar Cells

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