研究目的
Investigating the morphology evolution process and energetic level alignment of very thin solid films of the low molecular weight molecule DRCN5T and DRCN5T:[70]PCBM blend after applying thermal annealing at different temperatures to correlate these characteristics with the performance of organic solar cells.
研究成果
Thermal annealing results in a better nanoscale ordering of the small molecule DRCN5T films and the DRCN5T:[70]PCBM blend, leading to improved photovoltaic performance. Combining thermal annealing and solvent vapor annealing further enhances the performance, achieving a power conversion efficiency of 9.0%. The study provides insights into the fabrication and optimization of organic solar cells.
研究不足
The very thin organic films required for STM/STS analysis are destroyed by applying the solvent vapor annealing (SVA) process due to their thinness, limiting the analysis to thermal annealing only.
1：Experimental Design and Method Selection
The study used scanning tunneling microscopy (STM) and spectroscopy (STS) at the liquid/solid interface to analyze the morphology and energetic level alignment of DRCN5T and DRCN5T:[70]PCBM blend films after thermal annealing at different temperatures.
2：Sample Selection and Data Sources
DRCN5T and DRCN5T:[70]PCBM blend films were prepared by drop casting method on highly oriented pyrolytic graphite (HOPG) substrates. The films were thermally annealed at 80 °C and 120 °C for 10 min.
3：List of Experimental Equipment and Materials
STM/STS experiments were carried out with the Nanosurf Easyscan 2 STM/AFM. Mechanically cut platinum iridium (Pt-Ir) wires were used as STM tips. The films were prepared using DRCN5T and [70]PCBM purchased from 1-Materials.
4：Experimental Procedures and Operational Workflow
The films were deposited on HOPG substrates by drop casting method and thermally annealed. STM/STS measurements were performed at the liquid/solid interface with 1-phenyloctane as the liquid medium.
5：Data Analysis Methods
Images were processed and analyzed with Gwyddion open source software. The photovoltaic parameters were extracted from J-V curves measured under AM 1.5 G illumination.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
