Toward Efficient Polymer Solar Cells Processed by a Solution‐Processed Layer‐By‐Layer Approach |
| |
| Authors: | Yong Cui Shaoqing Zhang Ningning Liang Jingyi Kong Chenyi Yang Huifeng Yao Lijiao Ma Jianhui Hou |
| |
| Affiliation: | 1. State Key Laboratory of Polymer Physics and Chemistry, Beijing National Laboratory for Molecular Sciences, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China;2. School of Chemistry and Biology Engineering, University of Science and Technology Beijing, Beijing, China;3. School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, China |
| |
| Abstract: | The solution‐processed layer‐by‐layer (LBL) method has potential to achieve high‐performance polymer solar cells (PSCs) due to its advantage of enriching donors near the anode and acceptors near the cathode. However, power conversion efficiencies (PCEs) of the LBL‐PSCs are still significantly lower than those of conventional one‐step‐processed PSCs (OS‐PSCs). A method to solve the critical problems in LBL‐PSCs is reported here. By employing a specific mixed solvent (o‐dichlorobenzene o‐DCB]/tetrahydrofuran) to spin‐coat the small‐molecular acceptor IT‐4F onto a layer of the newly designed polymer donor (PBDB‐TFS1), appropriate interdiffusion between the PBDB‐TFS1 and the IT‐4F can critically be controlled, and then an ideal phase separation of the active layer and large donor/acceptor interface area can be realized with a certain amount of o‐DCB. The PSCs based on the LBL method exhibit PCEs as high as 13.0%, higher than that of the counterpart (11.8%) made by the conventional OS solution method. This preliminary work reveals that the LBL method is a promising approach to the promotion of the photovoltaic performance of polymer solar cells. |
| |
| Keywords: | high performance layer‐by‐layer polymer solar cells tunable interdiffusion |
|
|
