PFO-DBT:MEH-PPV:PC71BM Ternary Blend Assisted Platform as a Photodetector

Abstract

We present a ternary blend-based bulk heterojunction ITO/PEDOT:PSS/PFO-DBT:MEH-PPV:PC71BM/LiF/Al photodetector. Enhanced optical absorption range of the active film has been achieved by blending two donor components viz. poly[2,7-(9,9-di-octyl-fluorene)-alt-4,7-bis(thiophen-2-yl)benzo-2,1,3-thiadiazole] (PFO-DBT) and poly(2-methoxy-5(2′-ethylhexyloxy) phenylenevinylene (MEH-PPV) along with an acceptor component, i.e., (6,6)-phenyl-C71 hexnoic acid methyl ester. The dependency of the generation rate of free charge carriers in the organic photodetector (OPD) on varied incident optical power density was investigated as a function of different reverse biasing voltages. The photocurrent showed significant enhancement as the intensity of light impinging on active area of OPD is increased. The ratio of Ilight to Idark of fabricated device at −3 V was ∼3.5 × 104. The dynamic behaviour of the OPD under on/off switching irradiation revealed that sensor exhibits quick response and recovery time of <800 ms and 500 ms, respectively. Besides reliability and repeatability in the photoresponse characteristics, the cost-effective and eco-friendly fabrication is the added benefit of the fabricated OPD.

Intraparticle Energy Level Alignment of Semiconducting Polymer Nanoparticles to Amplify Chemiluminescence for Ultrasensitive In Vivo Imaging of Reactive Oxygen Species

“…(c) The fluorescence and chemiluminescence QYs of SPNs as a function of the energy intervals between the LUMO of 1,2-dioxentanedione and the HOMO of SPs. HOMO: −4.4 (PFPV), −5.0 (PFVA), −5.4 (PFODBT), −5.6 (PFO) and −5.9 ev (PFBT); the LUMO of 1,2-dioxetanedione is −3.2 ev …”

Self‐Illuminating NIR‐II Chemiluminescence Nanosensor for In Vivo Tracking H2O2 Fluctuation

“…To improve this, three semiconducting polymers with different HOMO levels, PFODBT, poly(9,9′‐dioctylfluorenyl‐2,7‐diyl) (PFO), and poly[(9,9′‐dioctylfluorenyl‐2,7‐diyl)‐alt‐(benzo[2,1,3]thiadiazol‐4,7‐diyl)] (PFBT), were combined with CPPO and F127 to synthesize the corresponding nanoprobes and compare their chemiluminescence intensities. The DOD has a LUMO level of −3.2 eV, [ 19 ] while PFODBT, PFO, and PFBT have HOMO levels of −5.4, [ 20 ] −5.6, [ 21 ] and −5.9 eV, [ 22 ] respectively ( Figure 3 a and Figure S11 , Supporting Information). Compared to the PFO CL nanoprobes and PFBT CL nanoprobes, the PFODBT CL nanoprobes showed the highest chemiluminescence intensity at various concentrations of H 2 O 2 (Figure 3b,c ).…”

Theoretical and Experimental Investigation of Barrier‐Energy‐Dependent Charge Injection Mechanisms in Organic Photodetectors

“…As Φ B has a direct correlation to charge injection, it can be modulated by utilizing photosensitive layers composed of different acceptors. The photoactive layers were composed of a donor, poly [4,8bis(5(2ethylhexyl)thiophen2yl)benzo[1,2b;4,5 b′]dithiophene2,6diylalt(4(2ethylhexyl)3fluorothieno [3,4b] thiophene)2carboxylate26diyl)] (PBDTTTEFT), [34][35][36] and three different acceptors ( [6,6]PhenylC 71 butyric acid methyl ester (PC 71 BM), [37][38][39] 2,2″[ [4,4,9,9tetrakis [40][41][42] and 5,5″[[4,4,9,9 tetrakis(2 ethylhexyl)4,9dihydros indaceno[1,2b:5,6b″]dithiophene2,7diyl]bis(2,1,3benzothiadi azole7,4diylmethylidyne)]bis[3ethyl2thioxo4thiazolidinone] (ehIDTBR)) (Figure 1a), [43][44][45] as a BHJ structure for efficient charge generation. [46][47][48] PC 71 BM is a representative fullerene derivative, and both IEICO4F and ehIDTBR are indacenodith iophene (IDT)based small molecule acceptors.…”