Deposition of LiF onto Films of Fullerene Derivatives Leads to Bulk Doping

Torabi, Solmaz; Liu, Jian; Gordiichuk, Pavlo; Herrmann, Andreas; Qiu, Li; Jahani, Fatemeh; Hummelen, Jan C.; Koster, L. Jan Anton

doi:10.1021/acsami.6b05638

Cited by 19 publications

(13 citation statements)

References 27 publications

(65 reference statements)

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“…This was due to the extended purification procedure of the ProSQ‐C6 compounds and, more pronounced, to the omission of a LiF interlayer at the aluminum cathode. Such thin LiF interlayers are widely used to enhance charge injection/extraction in organic electronic devices . However, in our case of the ProSQ‐C6 material, charge extraction was impaired.…”

Section: Resultsmentioning

confidence: 68%

Chiral Excitonic Organic Photodiodes for Direct Detection of Circular Polarized Light

Schulz

Balzer

Scheunemann

et al. 2019

Adv Funct Materials

100

108

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A facile route to soft matter self-powered bulk heterojunction photodiode detectors sensitive to the circular polarization state of light is shown based on the intrinsic excitonic circular dichroism of the photoactive layer blend. As light detecting materials, enantiopure semiconducting small molecular squaraine derivates of opposite handedness are employed. Via Mueller matrix ellipsometry, the circular dichroism is proven to be of H-type excitonic nature and not originating from mesoscopic structural ordering. Within the green spectral range, the photodiodes convert circular polarized light into a handedness-dependent photocurrent with a maximum dissymmetry factor of ±0.1 corresponding to 5% overall efficiency for the polarization discrimination under short circuit conditions. On the basis of transfer matrix optical simulations, it is rationalized that the optical dissymmetry fully translates into a photocurrent dissymmetry for ease of device design. Thereby, the photodiode's ability to efficiently distinguish between left and right circularly polarized light without the use of external optical elements and voltage bias is demonstrated. This allows a straightforward and sustainable future design of flexible, lightweight, and compact integrated platforms for chiroptical imaging and sensing.

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Section: Resultsmentioning

confidence: 68%

Chiral Excitonic Organic Photodiodes for Direct Detection of Circular Polarized Light

Schulz

Balzer

Scheunemann

et al. 2019

Adv Funct Materials

100

108

View full text Add to dashboard Cite

show abstract

“…Apart from PEDOT:PSS, which serves as a hole transport and planarization layer at the ITO electrode, other interlayers were omitted to prevent any effects of bulk doping caused by interlayer migration which could undermine the validity of the measured dielectric properties. 29 The fullerene-derivatives were spin-cast from several solvents (chloroform, ODCB, chlorobenzene, and THF). Spin-casting from chlorobenzene generally gave the best results for uniform film coverage of the substrate.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Reaching a Double-Digit Dielectric Constant with Fullerene Derivatives

et al. 2020

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The dielectric constant (εr) of organic semiconductors is a key material parameter for improving device performance in the field of organic electronics. However, the effect of the dielectric constant on the electronic and optoelectronic properties of materials remains unclear due to the scarcity of known organic semiconductors with an εr value higher than 6. Herein, the optical and electronic properties of a homologous series of fullerene derivatives with high εr are studied. The low frequency (<106 Hz) εr is extracted from the capacitance measured using impedance spectroscopy, and the effect of length (n) and geometrical arrangement of the polar ethylene glycol (EG) side chains is investigated. The εr is found to correlate with length for the symmetrical Bingel adducts, whereas for the unsymmetrical branched-EG chain adducts there is no significant difference between the two EG chain lengths. For BTrEG-2, the εr reaches 10, which is an unprecedented value in monoadduct fullerene derivatives. These materials open up new possibilities of studying the effect of εr in organic electronic devices such as organic photovoltaics, organic thermoelectrics, and organic field-effect transistors.

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“…The introduction of LiF buffer layer can facilitate electrons injection from C 60 and its derivatives into organic layers. [ 25–27 ] And MoO 3 is beneficial for hole injection. There are two paths to generate charge carriers in the CGU of LiF/C 60 /CuPc/MoO 3 .…”

Section: Resultsmentioning

confidence: 99%

Enhanced Efficiency of Tandem Organic Light‐Emitting Diodes via Manipulating Heterojunction Composition of Charge Generation Unit

Lü

Zhang

Wang³

et al. 2021

Physica Status Solidi (a)

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Tandem organic light‐emitting diodes (OLEDs) with an organic photovoltaic heterojunction (OPV‐HJ) as a charge generation unit (CGU), consisting of fullerence (C60) and copper phthalocyanine (CuPc), are fabricated. The device structures are ITO/EL unit/C60–CuPc HJ/MoO3/EL unit/Al, where EL unit is composed of NPB/Alq3/LiF. The efficiency improvement of tandem OLEDs is achieved by manipulating the structure and composition of C60–CuPc HJs. The charge generation and transport characteristics of CGUs are strongly dependent on the detailed structures of C60–CuPc HJs and the optimized CGU is 0.5:1 C60:CuPc bulk‐HJ. The improved efficiency of the tandem device with 0.5:1 C60:CuPc bulk‐HJ as CGU demonstrates to be the result of better charge carrier balance induced by the optimal charge transport and charge generation of C60:CuPc bulk‐HJs according to their surface morphology and absorption spectra. These results shed light on that C60:CuPc OPV‐HJ‐based CGU is a promising connection unit for the fabrication of high‐efficiency tandem OLEDs.

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Deposition of LiF onto Films of Fullerene Derivatives Leads to Bulk Doping

Cited by 19 publications

References 27 publications

Chiral Excitonic Organic Photodiodes for Direct Detection of Circular Polarized Light

Chiral Excitonic Organic Photodiodes for Direct Detection of Circular Polarized Light

Reaching a Double-Digit Dielectric Constant with Fullerene Derivatives

Enhanced Efficiency of Tandem Organic Light‐Emitting Diodes via Manipulating Heterojunction Composition of Charge Generation Unit

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