Comprehend the Optical, Morphological, and Electrical Characteristic of Air Processed Polymer Solar Cells

• Autor(a) principal: Carvalho, Andreia Filipa Garcia de
• Data de Publicação: 2021
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10362/136008
• topic: Organic solar cells; P3HT:PC61BM; Open-air fabrication; spin-coating technique; Absorption; Morphology; Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais

Solar energy via photovoltaic (PV) is a promising and freely accessible energy source that has become the main route for managing long term challenges in the energy crisis. Organic solar cells (OSCs) have raised interest in the scientific community due to their enormous potential in solar industry such as mechanical flexibility, exceptional processability, and capability of large-area roll-to-roll (R2R) manufacturing. In this work, we emphasize to understand the correlation between optical (absorbance and photoluminescence) and morphology properties of air processed photoactive layer, which are prepared at different spin-speeds (800 rpm, 1000 rpm, 1200 rpm, and 1500 rpm) and PC61BM concentration (1.0:0.6, 1.0:0.8 and 1.0:1.0 ratios) and its influence on the performance of OSCs devices. Here, OSCs devices have been fabricated in an inverted bulk heterojunction (BHJ) device configuration viz. sputtered Indium Thin Oxide (sITO)/Zinc oxide (ZnO)/P3HT:PC61BM/ Molybdenum trioxide (MoO3)/Silver (Ag). The sITO, ZnO, MoO3, and Ag were introduced as a transparent cathode electrode, electron transport layer (ETL), hole transport layer (HTL), and an anode electrode, respectively. The blend of regioregular poly(3-hexylthiophene-2,5-diyl) (rrP3HT), donor polymer, and [6,6] phenylC61-butyric acid methyl ester (PC61BM), acceptor molecule, is employed as a photoactive layer in the proposed devices. All the samples (for optical and morphological measurements) and solar cell devices were prepared via spin-coating technique without controlling the atmospheric conditions. A thin interface layer of MoO3 (10 nm, 0.2-0.5 Å/sec) and anode electrode (Ag, ≈ 150 nm, 1.5 Å/sec) were both deposited, sequentially, on the photoactive layer using thermal evaporation with a vacuum of 10-6 Torr. The photovoltaic performance parameters were explored by using current-voltage (J-V) characteristics. Furthermore, electrochemical impedance spectroscopy (EIS) was used to generate an electrical model for the extraction of charge transport parameters of air processed OSCs devices such as the chemical capacitance (Cμ), effective lifetime (τn), diffusion time (τd) and charge carrier mobility (μ). Additionally, the long-term stability of the produced photovoltaic devices is reported.