The influence of ionic radius of interfacial molecule on device performances of polymer solar cells

摘要

Ionic radius of interfacial molecular can affect the interface property and key electron transfer processes occurring at interface in polymer solar cells. To study the effects of different ionic radius of electron transfer layer on device performances, we introduce various stearate salts (Na+, K+and Cs+) as electron transfer layer to fabricate polymer solar cells. Interestingly, it is found that the key device parameters such asVoc,Jsc, fill factor and PCE of polymer solar cells present regular change with the ionic radius increasing. We systematically study the effects of different ionic radius of electron transfer layer on the various parameters of polymer solar cells and believe this regularity paves a way for further understanding and improving the performances of polymer solar cells.