Design of organic ternary blends and small-molecule bulk heterojunctions: photophysical considerations

Rajesh, Kallarakkal. R.; Paudel, Keshab Raj; Johnson, Brian; Hallani, Rawad K.; Anthony, John E.; Ostroverkhova, Oksana

doi:10.1117/1.jpe.5.057208

Cited by 9 publications

(17 citation statements)

References 51 publications

(127 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the spacer was eliminated, a strongly emissive CT state formation was observed; the presence of such tightly bound states subsequently was linked to inefficiency of diF TES-ADT:diCN TIPS-ADT BHJs and ternary blends based on these materials and P3HT. 188 Synergistically designed exciton and charge carrier dynamics for improved device performance has been realized in organic ternary BHJs, in which an additional donor or acceptor molecule is introduced into the standard, binary blends of donor and acceptor, thus creating D 1 :D 2 :A or D:A 1 :A 2 blends. These are designed to utilize FRET, cascade CT, and/or parallel-like CT to enhance charge generation (Section 9.3.4).…”

Section: Exciton Diffusionmentioning

confidence: 99%

“…However, the exciplex contribution to charge generation was small, 120,300 and its formation was detrimental for solar cell performance based on these materials. 188 Exciplex formation is a common phenomenon occurring at D/A interfaces formed by polymer or smallmolecule donor and nonfullerene acceptors. 377,378 However, in order to utilize these tightly bound CT states in charge generation, a mechanism is needed to reduce the binding energy.…”

Section: Experimental Evidencementioning

confidence: 99%

“…Optical Absorption and PL Imaging. Absorption and PL microscopy of organic semiconductors has been widely utilized to visualize domains and D/A interfaces in D:A blends, 188 quantify exciton diffusion, 128,137,852 examine the nature of exciton states depending on the molecular order in crystalline films, 109 probe exciton delocalization, 853 and so on.…”

Section: Microscopic Scalesmentioning

confidence: 99%

See 2 more Smart Citations

Organic Optoelectronic Materials: Mechanisms and Applications

2016

Self Cite

View full text Add to dashboard Cite

Organic (opto)electronic materials have received considerable attention due to their applications in thin-film-transistors, light-emitting diodes, solar cells, sensors, photorefractive devices, and many others. The technological promises include low cost of these materials and the possibility of their room-temperature deposition from solution on large-area and/or flexible substrates. The article reviews the current understanding of the physical mechanisms that determine the (opto)electronic properties of high-performance organic materials. The focus of the review is on photoinduced processes and on electronic properties important for optoelectronic applications relying on charge carrier photogeneration. Additionally, it highlights the capabilities of various experimental techniques for characterization of these materials, summarizes top-of-the-line device performance, and outlines recent trends in the further development of the field. The properties of materials based both on small molecules and on conjugated polymers are considered, and their applications in organic solar cells, photodetectors, and photorefractive devices are discussed.

show abstract

Section: Exciton Diffusionmentioning

confidence: 99%

Section: Experimental Evidencementioning

confidence: 99%

Section: Microscopic Scalesmentioning

confidence: 99%

See 1 more Smart Citation

Organic Optoelectronic Materials: Mechanisms and Applications

2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…produces more excited charge carriers. Making the sample more useful for use in many applications, such as photovoltaic devices [23]. The increment of absorption due to spectrum broadening so that absorbed light with wider range of wavelength.…”

Section: Fig 4: Ftir Patterns For Cupcts:bedot Pss Thin Films Chemicmentioning

confidence: 99%

Effect of annealing and chemical treatment on structural and optical properties of CuPcTs/PEDOT:PSS (BHJ Blend) thin films

Dr.¹

2019

IJP

View full text Add to dashboard Cite

In this work, The effect of annealing treatment at different temperatures (373, 423 and 473) K and chemical treatment with talwen at different immersion time (40, 60 and 80) min on structural and optical properties of the bulk heterojunction (BHJ) blend copper phthalocyanine tetrasulfonic acid tetrasodium salt/poly dioxyethylenethienylene doped with polystyrenesulphonic acid (CuPcTs/PEDOT:PSS) thin films were investigated. The films were fabricated using spin coating technique. X-ray diffraction (XRD) measurements displayed only one peak at 2θ =4.5o corresponding to (001) direction which has dhkl larger than for standard CuPcTs. The dhkl increase then decrease with increasing annealing temperature andthe time of chemical treatment with talwen. FTIR measurements show that, the peaks for O-H, in general, decrease with increasing annealing temperature, while the peaks corresponding to C=C aromatic bond and C-N bond decrease at 373 K then increase at 423 and 473 K. The peaks for O-H, in general, decrease with increasing immersing time, while the peaks corresponding to C=C aromatic bond and C-N bond decrease at 40 min then increase at more immersing time. From UV-visible measurements, the absorption spectra peaks for B and Q-bands increase at 373K and at 40 min immersing time with talwen and decrease at more annealing or chemical treated time.

show abstract

“…In some reports, small molecule donors were added into polymer/non‐fullerene mixture to create polymer/small molecule donors and non‐fullerene acceptor ternary OSCs. Ostroverkhova et al adopted P3HT as the main donor and two anthradithiophene(ADT) derivatives (Figure ), ADT‐TES‐F as an additional donor and ADT‐TIPS‐CN as acceptor, respectively in a ternary system. Comparing with the binary P3HT/ADT‐TIPS‐CN devices, the addition of ADT‐TES‐F in the range of 1 to 20 wt% led to an improvement in the PCE by a factor of ∼2 to 4 in the ternary devices depending on the ADT‐TES‐F contents, mostly likely due to the faster charge carrier photogeneration and FRET between ADT‐TES‐F and ADT‐TIPS‐CN.…”

Section: Different Types Of Ternary Systems Based On Non‐fullerene Acmentioning

confidence: 99%

Advances in Non‐Fullerene Acceptor Based Ternary Organic Solar Cells

2017

View full text Add to dashboard Cite

Ternary blend organic solar cells integrating multiple donor or acceptor materials in one photoactive layer have emerged as a promising strategy to simultaneously improve all device parameters compared with traditional binary solar cells. Recently, a large number of high‐performance non‐fullerene acceptor materials have been developed. Their preeminent advantages, such as strong light absorption ability and the tunability of optoelectronic properties, make them a compelling choice for fabricating ternary organic solar cells. Thus far, the state‐of‐the‐art efficiency of ternary blend system containing non‐fullerene acceptor has reached over 12%, and shows great potential in further improving the photovoltaic performance of the organic solar cells. In this review, we first describe the possible operation mechanisms in ternary systems and then primarily summarize the major achievements in different types of ternary systems based on non‐fullerene acceptors over the past few years. In the end, we conclude with the summary and prospects of non‐fullerene acceptor based organic ternary solar cells.

show abstract

Design of organic ternary blends and small-molecule bulk heterojunctions: photophysical considerations

Cited by 9 publications

References 51 publications

Organic Optoelectronic Materials: Mechanisms and Applications

Organic Optoelectronic Materials: Mechanisms and Applications

Effect of annealing and chemical treatment on structural and optical properties of CuPcTs/PEDOT:PSS (BHJ Blend) thin films

Advances in Non‐Fullerene Acceptor Based Ternary Organic Solar Cells

Contact Info

Product

Resources

About