Enhanced Performance Using an SU-8 Dielectric Interlayer in a Bulk Heterojunction Organic Solar Cell

Pang, Christina; Chellappan, Vijila; Yim, Ji Hye; Tan, Mein Jin; Goh, Glen Tai Wei; Lee, Soonil; Zhang, Jie; Mello, John C. de

doi:10.1021/am508177p

Cited by 11 publications

(6 citation statements)

References 46 publications

(66 reference statements)

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“…Inspiringly, some efforts from the independent groups have been devoted to solving these problems. , Ultraviolet (UV) treatment is a common method to eliminate the s-shaped J – V curve and enhance the performance of i-PSCs with ZnO. , Reportedly, the surface of ZnO was treated by UV irradiation to passivate the surface defects and thus decrease the carrier recombination rate at the ZnO/active layer interface, leading to increased conductivity of the ZnO layer . However, long time UV irradiation easily damages the organic active layer, which inevitably impacts the device efficiency and stability .…”

Section: Introductionmentioning

confidence: 99%

Alcohol-Soluble Isoindigo Derivative IIDTh-NSB as a Novel Modifier of ZnO in Inverted Polymer Solar Cells

Guo

Han

Qiu

et al. 2017

ACS Appl. Mater. Interfaces

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Alcohol-soluble isoindigo derivative with thiophene groups and sulfobetaine zwitterions, IIDTh-NSB was applied as a novel modifier of ZnO in inverted polymer solar cells (i-PSCs). When IIDTh-NSB (0.2 mg/mL) was spin-coated on ZnO as an electron transport layer (ETL), power conversion efficiency (PCE) of the PTB7:PCBM based i-PSCs reached 8.88%, which is a 20% improvement of that of 7.40% for the device with the ZnO-only ETL. If ZnO was doped by IIDTh-NSB of 1.0 wt %, the PCE of 8.50% could be achieved in the i-PSCs. Combined measurements of capacitance-voltage characteristics, carrier mobility, and photocurrent density-effective voltage characteristics revealed that incorporating IIDTh-NSB as the modifier of ZnO by coating or doping enhanced the built-in potential, charge carrier density and mobility, exciton dissociation, and charge carrier extraction in the i-PSCs because of the improved interfacial contact between the photoactive layer and ZnO as shown in water contact angle measurements and atomic force microscopy images. Finally, impedance spectroscopy investigation provided strong lines of evidence that incorporating IIDTh-NSB as the modifier of ZnO led to the great enhancement in short-circuit current density and fill factor. Furthermore, all the devices with IIDTh-NSB as a modifier of ZnO presented better stability than the device with ZnO-only. These findings suggest that IIDTh-NSB is an effective and competitive material for modification of ZnO in the i-PSCs.

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Section: Introductionmentioning

confidence: 99%

Alcohol-Soluble Isoindigo Derivative IIDTh-NSB as a Novel Modifier of ZnO in Inverted Polymer Solar Cells

Guo

Han

Qiu

et al. 2017

ACS Appl. Mater. Interfaces

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“…This enhancement could be due to the improved interfacial interaction between the active layer and Al-SG cathode. The improved interfacial interaction reduces interfacial trap states and hence reduced surface charge accumulation, since reduced interfacial trap state density and improved electronic coupling between Al-SG cathode with P3HT:PC 61 BM leads to improved PCE. , Moreover, reduced series resistance of device-B is suggested as the reason for improved J SC and FF . These increased FF also suggests the better physical interface in Al-SG devices for charge transfer.…”

Section: Photovoltaic Propertiesmentioning

confidence: 98%

Interface Electrode Morphology Effect on Carrier Concentration and Trap Defect Density in an Organic Photovoltaic Device

Kesavan

Rao

Ramamurthy

2017

ACS Appl. Mater. Interfaces

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Formation of Schottky barrier contact (SBC) leads reconstruction of charges at the metal/semiconductor (MS) interface because of the wave function overlap between semiconductor and metal contact. Not only is the Schottky barrier contact formation a signature of the material's work function, but also it is sensitive to the interface trap states, the crystal orientation of the interacting materials, and other interface properties. In this work, the effect of aluminum cathode morphology on the polymer Schottky diode and bulk heterojunction (BHJ) photovoltaic device performance is studied. The electron collecting contacts in Schottky diode and BHJ device have been deposited using aluminum in pellet and nanoparticle forms. Devices fabricated by using Al nanoparticle showed improvement in dark as well as photocurrent density. Significant enhancement in J leads to overall improved power conversion efficiency. Enhanced performance in Schottky structured diode and OPV device have been correlated with electrode microstructure and its interface properties such as improved electrically active contact and enhanced charge transport. Electrical conductivity is discussed based on enhanced electrical coherence across organic semiconductor and electrode interface. Therefore, the contribution of electrical enhancement leads to improvement in short-circuit current density (J) in BHJ solar cell which is due to reduced trap density. Further, PCE was correlated with the density of interface trap states studied by drive level capacitance profiling technique.

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“…Through transient photovoltage (TPV) spectroscopy and double injection (DoI) techniques, it was found that SU‐8 increased the carrier lifetime from 0.1 to 0.3 ms and induced similar mobility to the SU‐8‐free device. [ 65 ] It was indicated that SU‐8 slowed down the charge recombination dynamics, which improved the FF and PCE in the OSCs based on P3HT:PC 61 BM. Interestingly, the device with SU‐8 interlayer showed increased FF and retained 85% of the original PCE after 33‐week storage in ambient conditions due to the encapsulation effect of insulating SU‐8.…”

Section: The Progress In I‐oscsmentioning

confidence: 99%

Recent Progress of Organic Solar Cells with Insulating Polymers

2020

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Organic solar cells (OSCs), as a promising photovoltaic technology, have made great progress recently due to the various optimization methods and designs of new materials. However, the general strategies show some restrictions on photovoltaic systems and commercialization of OSCs. Insulating polymers with low costs exhibit rich functionality, enhance device performance, and stabilize film morphology in air or at a high temperature. Herein, the strategies of the ternary, interface layer, and block copolymer in insulator‐modified OSCs (i‐OSCs) reported in recent years are highlighted. In addition, the corresponding underlying mechanisms, such as crystallinity, self‐assembly, dipole interaction, and charge transfer, are also discussed. The applications of insulating polymers in OSCs open a novel avenue for optimizing device performance and bestow a potential pathway to achieve large‐scale industrial production in the future.

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Enhanced Performance Using an SU-8 Dielectric Interlayer in a Bulk Heterojunction Organic Solar Cell

Cited by 11 publications

References 46 publications

Alcohol-Soluble Isoindigo Derivative IIDTh-NSB as a Novel Modifier of ZnO in Inverted Polymer Solar Cells

Alcohol-Soluble Isoindigo Derivative IIDTh-NSB as a Novel Modifier of ZnO in Inverted Polymer Solar Cells

Interface Electrode Morphology Effect on Carrier Concentration and Trap Defect Density in an Organic Photovoltaic Device

Recent Progress of Organic Solar Cells with Insulating Polymers

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