DOI: https://doi.org/10.29363/nanoge.hopv.2016.213
Publication date: 28th March 2016
Bulk heterojunction structure organic solar cells (OSCs) have received very much attention because of their unique advantage of solution processability and mechanical flexibility. So far OSCs using a polymer donor and fullerene derivative acceptor have achieved power conversion efficiency (PCE) over 12%. It has been reported that number-average molecular weight (Mn) of polymers has great influence on OSCs’ performance, leading to batch-to-batch devices’ performance variations. In our previous report, we investigated the effects of Mn of our newly synthesized low bandgap polymer, PDTBT-TT, on OSCs’ performance. We found that OSCs based on higher Mn PDTBT-TT had higher PCE of 6.71% but the solubility of PDTBT-TT in o-dichlorobenzene decreased with increasing Mn thus leading to rougher active layer surface and higher series resistance. To overcome this problem, we further modified the chemical structure of PDTBT-TT to get a new copolymer, polymer 1. Polymer 1 and PDTBT-TT have similar Mn but polymer 1 has higher solubility because of larger dihedral angles. After applying polymer 1 into OSCs, the highest PCE of 7.45% was obtained from the optimized device. The open circuit voltage (Voc) of OSCs based on polymer 1 was 0.81 V while the Voc of OSCs based on PDTBT-TT was only 0.70 V. These findings are helpful for designing new high- performance polymers for OSCs.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.