| 초록 |
Recently organic solar cells (OSCs) have been attracted because of advantages such as low cost, flexibility, and light weight. Through the continuous development of electron donor and acceptor materials, power conversion efficiencies (PCEs) have been achieved over 13%, but electron acceptor materials need further development compare with electron donor materials. For the high PCEs, electron donor and acceptor materials have suitable energy levels, and energy levels can be controlled easily by changing the core, end-capping units or the substituents. In this work, we synthesized four new small molecule electron acceptor materials, in which the conjugation lengths of core units were controlled. We measured the optical and electrochemical properties of these materials, fabricated OSC devices, and established the relationship between conjugation length and photovoltaic properties. |
