Solution-Processed Metal Oxide Nanostructures for Carrier Transport

Yang, Sheng‐Hsiung

doi:10.3390/nano13081331

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…One of the key factors that directly affects the performance of i OSC devices is an electron transport layer (ETL), which is especially important for controlling interface morphology properties between the ITO cathode and photoactive layer and simultaneously plays a role as a hole-blocking layer. , Among several kinds of ETL materials, n-type metal oxides (MOs) (e.g., ZnO and TiO 2 ) exhibit the advantages in terms of their high stability, high electron mobility, low conduction band, and ability to effectively tune the high WF of ITO cathodes in i OSCs. , However, MO ETLs often suffer from problems caused by their hydrophilic surfaces due to the presence of hydroxyl groups and the existence of defects, such as oxygen vacancies and zinc interstitium, leading to low device performance due to high charge trapping and recombination at the MO ETL/photoactive interface. − To overcome these problems, inserting an interfacial modifier (IM), such as small molecules with polar functional groups (carboxylic acids, amine, and so on − ), nonconjugated polymer electrolytes (NPEs), or conjugated polymer electrolytes (CPEs), − onto the surface of MO ETLs is a promising strategy to upgrade both the photovoltaic performance and device stability of i OSCs.…”

Section: Introductionmentioning

confidence: 99%

Inorganic/Organic Electron Transport Interface Engineering for Planar and Fiber-Shaped Organic Solar Cells

Nguyen

Park²,

Woo

et al. 2023

ACS Appl. Energy Mater.

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Using an interfacial modifier (IM) agent to overcome interfacial problems of zinc oxide (ZnO), which is commonly used as an electron transport layer (ETL), is an effective interfacial engineering strategy that can be used to improve the performance and stability of optoelectronic devices, such as inverted organic solar cells (iOSCs). In this work, a conjugated polymer electrolyte (CPE) is employed as an IM agent to modify the surface morphology of ZnO ETL-based iOSC devices. Compared to a pristine ZnO ETL, the CPE-modified ZnO (CPE/ZnO) ETL is more hydrophobic with a smooth surface induced by an interfacial dipole, resulting in better energy alignment to the LUMO of the photoactive layer. The power conversion efficiency (PCE) of poly(3-hexylthiophene) (P3HT) and phenyl-C 60 -butyric acid methyl ester (PCBM) blend-based planar iOSCs with a CPE/ZnO ETL increases from 3.8% to 4.2% and from 1.8% to 2.2% for bottom and top transparent devices, respectively. The CPE/ZnO ETL is further employed to fabricate a fiber-shaped iOSC (FS-iOSC), which is a promising wearable optoelectronic device. In FS-iOSCs fabricated by a dip-coating method with a CPE/ZnO ETL, the PCE improves to 1.02%, which is a near 2-fold improvement over devices using a pristine ZnO ETL. Additionally, our concept has also been successfully applied to inverted polymer light-emitting diodes (iPLED) with planar and fiber-shaped configurations. These results suggest that the surface modification of metal oxide ETLs (e.g., ZnO) with organic interfacial modifiers (e.g., CPE) is a simple but effective approach to fabricating planar and fiber-shaped optoelectronic devices with high performance.

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