Diffusion length of singlet excitons in copper phthalocyanine films

Signerski, R.; Jarosz, G.

doi:10.4302/plp.2011.3.06

Cited by 6 publications

(4 citation statements)

References 22 publications

(40 reference statements)

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“…Because of the exponential attenuation of overlap of the donor and acceptor molecular orbitals with distance between molecules, contributions from Dexter energy transfer are normally negligible. The efficiency of this type of energy transfer process can be calculated from FRET theory . In FRET theory the exciton diffusion coefficient can be calculated from the spectral overlap of the absorption and emission of the chromophores.…”

Section: Resultsmentioning

confidence: 99%

Competitive Absorption and Inefficient Exciton Harvesting: Lessons Learned from Bulk Heterojunction Organic Photovoltaics Utilizing the Polymer Acceptor P(NDI2OD‐T2)

Lin

Phan

et al. 2014

Adv Funct Materials

139

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Organic solar cells utilizing the small molecule donor 7,7′‐(4,4‐bis(2‐ethylhexyl)‐4H‐silolo[3,2‐b:4,5‐b′]dithiophene‐2,6‐diyl)bis(6‐fluoro‐4‐(5′‐hexyl‐[2,2′‐bithiophen]‐5‐yl)benzo[c][1,2,5] thiadiazole) (p‐DTS(FBTTh2)2 and the polymer acceptor poly{[N,N′‐bis(2‐octyldodecyl)‐1,4,5,8‐naphthalenedicarboximide‐2,6‐diyl]‐alt‐5,5′‐(2,2′‐bithiophene)}(P(NDI2OD‐T2)) are investigated and a power conversion efficiency of 2.1% is achieved. By systematic study of bulk heterojunction (BHJ) organic photovoltaic (OPV) quantum efficiency, film morphology, charge transport and extraction and exciton diffusion, the loss processes in this blend is revealed compared to the blend of [6,6]‐phenyl‐C71‐butyric acid methyl ester (PC71BM) and the same donor. An exciton diffussion study using Förster resonant energy transfer (FRET) shows the upper limit of the P(NDI2OD‐T2) exciton diffusion length to be only 1.1 nm. The extremely low exciton diffusion length of P(NDI2OD‐T2), in combination with the overlap in donor and acceptor absorption, is then found to significantly limit device performance. These results suggest that BHJ OPV devices utilizing P(NDI2OD‐T2) as an acceptor material will likely be limited by its low exciton diffusion length compared to devices utilizing functionalized fullerene acceptors, especially when P(NDI2OD‐T2) significantly competes with the donor molecule for photon absorption.

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Section: Resultsmentioning

confidence: 99%

Competitive Absorption and Inefficient Exciton Harvesting: Lessons Learned from Bulk Heterojunction Organic Photovoltaics Utilizing the Polymer Acceptor P(NDI2OD‐T2)

Lin

Phan

et al. 2014

Adv Funct Materials

139

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“…4c). In addition, when the CuPc layer is much thicker than the exciton diffusion length (∼1.6 nm), 44 the photo-generated electron and hole pairs will recombine before they separate and will not contribute to the photocurrent. Therefore, as an overall effect, such as the contribution of photo-generated electrons in the CuPc layer, recombination processes, and exciton diffusion length, the relatively thinner CuPc/MoS 2 devices (near the 2 nm CuPc) exhibited higher photoresponsivity than the relatively thicker CuPc/MoS 2 devices.…”

Section: Optical Properties With Different Cupc Layersmentioning

confidence: 99%

Enhancement of photodetection characteristics of MoS₂field effect transistors using surface treatment with copper phthalocyanine

et al. 2015

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Recently, two-dimensional materials such as molybdenum disulfide (MoS2) have been extensively studied as channel materials for field effect transistors (FETs) because MoS2 has outstanding electrical properties such as a low subthreshold swing value, a high on/off ratio, and good carrier mobility. In this study, we characterized the electrical and photo-responsive properties of MoS2 FET when stacking a p-type organic copper phthalocyanine (CuPc) layer on the MoS2 surface. We observed that the threshold voltage of MoS2 FET could be controlled by stacking the CuPc layers due to a charge transfer phenomenon at the interface. Particularly, we demonstrated that CuPc/MoS2 hybrid devices exhibited high performance as a photodetector compared with the pristine MoS2 FETs, caused by more electron-hole pairs separation at the p-n interface. Furthermore, we found the optimized CuPc thickness (∼2 nm) on the MoS2 surface for the best performance as a photodetector with a photoresponsivity of ∼1.98 A W(-1), a detectivity of ∼6.11 × 10(10) Jones, and an external quantum efficiency of ∼12.57%. Our study suggests that the MoS2 vertical hybrid structure with organic material can be promising as efficient photodetecting devices and optoelectronic circuits.

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“…Next, the value of at least 100 nm was obtained for diindenoperylene (DIP) films . Finally, from the PC‐treatment applied to vacuum‐deposited films of copper phthalocyanine, the diffusion length varying between 1.6 and 16 nm was obtained . Interestingly, a consistent value of the singlet exciton diffusion length of (20 ± 5) nm in this material was determined in an earlier paper .…”

Section: Introductionmentioning

confidence: 59%

Singlet Exciton Diffusion in Vacuum‐Evaporated Films of Amine‐Based Materials as Studied by Photocurrent and Photoluminescence Quenching Methods

Pelczarski

Grygiel

Stampor

2018

Physica Status Solidi (b)

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The singlet exciton diffusion lengths are determined by the photoconductivity as well as the luminescence surface quenching technique, in vacuumevaporated layers of (4,4 0 ,4 00 -tris(N-(3-methylphenyl)-N-phenylylamino) triphenylamine) (m-MTDATA), 4,4 0 ,4 00 -tris[2-naphthyl(phenyl)amino] triphenylamine (2TNATA), and N,N 0 -diphenyl-N,N 0 -bis(3-methylphenyl)-[1,1 0 -biphenyl]-4,4 0 -diamine (TPD) which are frequently used for fabrication of electroluminescent and photovoltaic devices. The values are found to be as high as (30 AE 10) nm in 2TNATA and m-MTDATA, as well as (46 AE 9) nm in TPD films. The corresponding singlet diffusion coefficients of the range between 1 Â 10 À3 and 1 Â 10 À2 cm 2 s À1 , according to a comprehensive study undertaken, are assigned to a sizable electronic coupling induced by strong interactions of intra-and inter-molecular origin in the investigated materials.

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Diffusion length of singlet excitons in copper phthalocyanine films

Abstract: Abstract-The work presents a method of extraction of exciton

Cited by 6 publications

References 22 publications

Competitive Absorption and Inefficient Exciton Harvesting: Lessons Learned from Bulk Heterojunction Organic Photovoltaics Utilizing the Polymer Acceptor P(NDI2OD‐T2)

Competitive Absorption and Inefficient Exciton Harvesting: Lessons Learned from Bulk Heterojunction Organic Photovoltaics Utilizing the Polymer Acceptor P(NDI2OD‐T2)

Enhancement of photodetection characteristics of MoS₂field effect transistors using surface treatment with copper phthalocyanine

Singlet Exciton Diffusion in Vacuum‐Evaporated Films of Amine‐Based Materials as Studied by Photocurrent and Photoluminescence Quenching Methods

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Diffusion length of singlet excitons in copper phthalocyanine films

Abstract: Abstract-The work presents a method of extraction of exciton

Cited by 6 publications

References 22 publications

Competitive Absorption and Inefficient Exciton Harvesting: Lessons Learned from Bulk Heterojunction Organic Photovoltaics Utilizing the Polymer Acceptor P(NDI2OD‐T2)

Competitive Absorption and Inefficient Exciton Harvesting: Lessons Learned from Bulk Heterojunction Organic Photovoltaics Utilizing the Polymer Acceptor P(NDI2OD‐T2)

Enhancement of photodetection characteristics of MoS2field effect transistors using surface treatment with copper phthalocyanine

Singlet Exciton Diffusion in Vacuum‐Evaporated Films of Amine‐Based Materials as Studied by Photocurrent and Photoluminescence Quenching Methods

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Enhancement of photodetection characteristics of MoS₂field effect transistors using surface treatment with copper phthalocyanine