Study of electrical properties of fullerene based all-small-molecule low donor organic devices with and without cathode buffer layers for photovoltaic application

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER Physica B-condensed Matter Pub Date : 2024-09-18 DOI:10.1016/j.physb.2024.416552

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Abstract

This article examines electrical properties of fullerene (C70) based all-small-molecule organic photovoltaics with low donor concentration. Enhancements in the properties of devices are observed with the incorporation of lithium fluoride (LiF) and molybdenum trioxide (MoO₃) as cathode buffer layers (CBLs). Samples are characterized using field emission-scanning electron microscopy (FESEM), optical absorption spectra, current-voltage (I-V) characteristics in dark and under illumination, and capacitance-frequency (C-ω) measurements. Device with single CBL (LiF) exhibits reduced photoabsorption leading to less saturation photocurrent density (J_sat) and lower maximum exciton generation rate (G_max), due to non-uniform deposition of LiF in device. In contrast, device having two CBLs (LiF & MoO₃) has enhanced the photoabsorption exhibiting high J_sat and G_max attributed to uniform deposition of MoO₃. Moreover, dielectric properties and AC conductivity of devices are also measured confirming the results and these are found to be dependent on the frequency and voltage.

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基于富勒烯的有阴极缓冲层和无阴极缓冲层低供体全小分子有机器件在光伏应用中的电气性能研究

本文研究了基于富勒烯（C70）的低供体浓度全小分子有机光伏器件的电学特性。在加入氟化锂（LiF）和三氧化钼（MoO3）作为阴极缓冲层（CBL）后，观察到器件的特性得到了增强。利用场发射扫描电子显微镜 (FESEM)、光吸收光谱、暗态和光照下的电流电压 (I-V) 特性以及电容频率 (C-ω) 测量对样品进行了表征。由于器件中 LiF 的沉积不均匀，单 CBL（LiF）器件的光吸收减少，导致饱和光电流密度（Jsat）降低，最大激子产生率（Gmax）降低。相比之下，具有两个 CBL（LiF & MoO3）的器件由于 MoO3 的均匀沉积而增强了光吸收，表现出较高的 Jsat 和 Gmax。此外，还测量了器件的介电性能和交流电导率，证实了上述结果，并发现它们与频率和电压有关。

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces