During the rapid development period of third-generation photovoltaics, organic solar cells (OSCs) have addressed great attention from academia and industry, due to their unreplaceable advantages (colour-tunability, low-cost, semi-transparency, flexibility etc.) enabled broad application prospect. At present, the power conversion efficiency (PCE) of OSC is still the main parameter that needs to be promoted, and single-junction OSC is preferred thanks to the easier fabrication compared with tandem structure OSC. However, the PCE of single-junction OSC is limited by the traditional binary donor-acceptor mixtures, due to the insufficient light harvesting and non-ideal morphology. In view of this, multicomponent photovoltaic blend construction has been a hot topic in recent years, for it can...[ Read more ]

During the rapid development period of third-generation photovoltaics, organic solar cells (OSCs) have addressed great attention from academia and industry, due to their unreplaceable advantages (colour-tunability, low-cost, semi-transparency, flexibility etc.) enabled broad application prospect. At present, the power conversion efficiency (PCE) of OSC is still the main parameter that needs to be promoted, and single-junction OSC is preferred thanks to the easier fabrication compared with tandem structure OSC. However, the PCE of single-junction OSC is limited by the traditional binary donor-acceptor mixtures, due to the insufficient light harvesting and non-ideal morphology. In view of this, multicomponent photovoltaic blend construction has been a hot topic in recent years, for it can significantly improve the PCE and breakthrough the performance bottleneck for OSCs. In this thesis, I will introduce my research results based on three-component (ternary) strategy for highly efficient single-junction OSCs, demonstrating not only excellent PCE improvement, but also in-depth understanding of how this tactic optimizes the blend morphology. This thesis is constituted of six chapters:

Chapter I is the general introduction of organic solar cells.

Chapter II, III, IV and V present my representative works based on this topic during the PhD study.

Chapter VI is the summary of the thesis, and future perspectives regarding the further development of high-performance single-junction OSCs.