Light-emission organic solar cells with MoO<sub>3</sub>:Al interfacial layer–preparation and characterizations

doi:10.1007/s12200-020-1103-2

Front. Optoelectron.

2021, Vol. 14

Issue (4) : 499-506 https://doi.org/10.1007/s12200-020-1103-2

RESEARCH ARTICLE

Light-emission organic solar cells with MoO₃:Al interfacial layer–preparation and characterizations

Xinran LI¹, Yanhui LOU¹(

), Zhaokui WANG²(

)

¹. College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
². Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou 215123, China

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Abstract

A light-emitting organic solar cell (LE-OSC) with electroluminescence (EL) and photovoltaic (PV) properties is successfully fabricated by connecting the EL and PV units using a MoO₃:Al co-evaporation interfacial layer, which has suitable work function and good transmittance. PV and EL units are fabricated based on poly(3-hexylthiophene) (P3HT)-indene-C₆₀ bisadduct (IC₆₀BA) blends, and 4,4′-bis (N-carbazolyl) biphenyl-fac-tris (2-phenylpyridine) iridium (Ir(ppy)₃), respectively. The work function and the transmittance of the MoO₃:Al co-evaporation are measured and adjusted by the ultraviolet photoelectron spectroscopy and the optical spectrophotometer to obtain the better bi-functional device performance. The forward- and reverse-biased current density-voltage characteristics in dark and under illumination are evaluated to better understand the operational mechanism of the LE-OSCs. A maximum luminance of 1550 cd/m² under forward bias and a power conversion efficiency of 0.24% under illumination (100 mW/cm²) are achieved in optimized LE-OSCs. The proposed device structure is expected to provide valuable information in the film conditions for understanding the polymer blends internal conditions and meliorating the film qualities.

Keywords organic solar cell (OSC) polymer-fullerene light emission MoO₃:Al interfacial layer

Corresponding Author(s): Yanhui LOU,Zhaokui WANG

Just Accepted Date: 17 November 2020 Online First Date: 10 December 2020 Issue Date: 06 December 2021

Cite this article:

Xinran LI,Yanhui LOU,Zhaokui WANG. Light-emission organic solar cells with MoO₃:Al interfacial layer–preparation and characterizations[J]. Front. Optoelectron., 2021, 14(4): 499-506.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-020-1103-2
https://academic.hep.com.cn/foe/EN/Y2021/V14/I4/499

Fig.1 (a) Schematic diagram of the light-emitting organic solar cells (LE-OSCs) and the molecule structure of materials upon investigation. (b) Energy levels of the materials in LE-OSCs

Fig.2 Ultraviolet photoelectron spectroscopy (UPS) spectra of pure MoO₃, co-evaporated MoO₃:Al films. The inset is the enlarged regions of the photoemission secondary-electron cut-offs

Fig.3 Transmittance spectra of P3HT:IC₆₀BA (150 nm) and P3HT:IC₆₀BA (150 nm)/MoO₃:Al (5 nm). The dash line is a sign of EL peak of Ir(ppy)₃

Fig.4 Current density−voltage (J−V) characteristics in the LE-OSCs with and without (W/O) interfacial layer (IL) and the reference device (OSC only) with a structure of ITO/PEDOT (50 nm)/ P3HT:IC₆₀BA (150 nm)/LiF (1 nm)/Al (70 nm) under illumination (100 mW/cm²)

Tab.1 PV and EL properties in LE-OSCs with and without (W/O) interfacial layers (IL). The performance of reference devices (OSC only and OLED only) is also shown

Fig.5 EL properties for (a) current density−voltage (J−V) and (b) luminance vs current density (L−J) characteristics, respectively, in LE-OSCs with and without (W/O) interfacial layer (IL) in dark condition

Fig.6 Forward- and reverse-biased current density−voltage (J−V) characteristics of LE-OSCs in dark and under illumination (100 mW/cm²). The insets are the corresponding double-logarithmic plots

Fig.7 Photograph and EL imaging (2 mm × 2 mm) of (a) pinholes, (b) film uniformity and (c) strip lines of P3HT:IC₆₀BA blending films in different samples observed by conventional back light and OLED imaging

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