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5,5′-[[4,4,9,9-Tetrakis(4-hexylphenyl)-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl]bis(2,1,3-benzothiadiazole-7,4-diylmethylidyne)]bis[3-ethyl-2-thioxo-4-thiazolidinone], IDT-BT-R
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:


Band gap: 1.83 eV





mol wt

1518.20 g/mol




chloroform: soluble

orbital energy

HOMO -5.52 eV 
LUMO -3.69 eV 

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General description

Non-fullerene acceptors (NFAs) are currently a major focus of research in the development of bulk-heterojunction organic solar cells (OSCs). In contrast to the widely used fullerene acceptors (FAs), the optical properties and electronic energy levels of NFAs can be designed and readily tuned. NFA-based OSCs can also achieve greater thermal stability and photochemical stability, as well as longer device lifetimes, than their FA-based counterparts.Recent developments have led to a rapid increase in power conversion efficiencies for NFA OSCs, with values now exceeding 15% in a single junction cell, and >17% for a tandem cell, demonstrating the viability of using NFAs to replace FAs in next-generation high-performance OSCs.


IDT-2BR is a medium-high bandgap non fullerene acceptors (NFAs) which can be utilized as a p-dopant in the fabrication of p-type organic semiconductors for OFETs (Organic Field-Effect Transistors). IDT-2Br is used as a halogen-based flame retardant additive in the production of printed circuit boards (PCBs). It helps improve the fire resistance of PCB materials, ensuring their safety during use. It can be incorporated into the polymer or small molecule-based photoactive materials, contributing to the absorption of light and facilitating charge generation in the OPV device. Its presence in the active layer can help enhance the light absorption and power conversion efficiency of the solar cell.
IDT-2BR is a medium-high bandgap nonfullerene acceptors (NFAs). It was reported that IDT-2BR could produce a high power conversion efficiency (PCE) of over 10% when used with low-bandgap p-type polymer PTB7-Th (Product No. 794333). A prominent feature of this blend is the very small energy loss (< 0.6 eV) in the cell, which allows for a very high open circuit voltages in the device (> 1 V).
Ternary blend organic solar cells (OSCs) with photoresponses beyond 1000 nm can be fabricated using PTB7-Th as donor and ultralow-bandgap F8IC and medium-high bandgap IDT-2BR as NFAs. A PCE of 12.1% has been achieved by such a ternary device with 20% IDT-2BR content in acceptors. In this work, IDT-2BR was found to contribute simultanously to the improvement of the open-circuit voltage (VOC), short-circuit (JSC) and fill factor (FF) of the PTB7-Th/F8IC blend, due to smaller energy offset for charge separation, suppressed charge recombination, and imporved light absorption. Improved packing due to the coexsitence of F8IC and IDT-2BR leads to higher mobilities and more balanced charge transport, which contribute to the improved FF as well.
Additionaly, blends with IDT-2BR have been found to be thermally stable at 150 Celsius.
A ternary blend using both IDT-2BR and fullerene based acceptor: PC71BM (Product No. 684465) has also reached a PCE over 12%.

Storage Class

13 - Non Combustible Solids




Not applicable


Not applicable

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High-performance ternary organic solar cells with photoresponses beyond 1000 nm
X Peiyao, et al,.
Journal of Material Chemistry A, 6(47), 24210-24215 (2018)
Min Kim et al.
ACS applied materials & interfaces, 10(30), 25570-25579 (2018-07-10)
Ternary blending is an effective strategy for broadening the absorption range of the active layer in bulk heterojunction polymer solar cells and for constructing an efficient cascade energy landscape at the donor/acceptor interface to achieve high efficiencies. In this study
Pei Cheng et al.
Advanced materials (Deerfield Beach, Fla.), 29(11) (2017-01-20)
A new, easy, and efficient approach is reported to enhance the driving force for charge transfer, break tradeoff between open-circuit voltage and short-circuit current, and simultaneously achieve very small energy loss (0.55 eV), very high open-circuit voltage (>1 V), and
Efficient device engineering for inverted non-fullerene organic solar cells with low energy loss
Xiao J, et al.
Journal of Material Chemistry C, 6 (16), 4457-4463 (2018)


Professor Chen (Nankai University, China) and his team explain the strategies behind their recent record-breaking organic solar cells, reaching a power conversion efficiency of 17.3%.

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