Abstract
In this letter, the efficiency enhancement of polymer solar cells is achieved via interface modification. The Cs2CO3 is incorporated onto TiO2 electron transport layer, which leads to an increase of power conversion efficiency from 5.25% to 6.88%. The introduction of Cs2CO3 modification layer can improve the contact between active layer and electron transport layer, and the ultrathin Cs2CO3 layer hardly hinders the electron transport due to the quantum tunneling effect, resulting in the improvement of short circuit current and the fill factor.
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