We demonstrate morphological and optical engineering by using processing additives and optical spacers for polymer solar cells. Among various processing additives, introduction of diphenyl ether (DPE) into the active layer results in the smoothest surface roughness with uniform and well-distributed donor/acceptor domains, and the device with DPE shows the highest device efficiency of 10.22% due to enhanced charge collection efficiency and minimized recombination loss. Additional ZnO optical spacers on the active layer controls the distribution of the electric field in the whole device and enhances the light absorption within the active layer, thereby improving device efficiency up to 10.81%.
Bibliographical noteFunding Information:
This work was supported by National Research Foundation of Korea (NRF-2018R1C1B6001015) and the Technology Development Program to Solve Climate Changes of the National Research Foundation (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2015M1A2A2057506, 2016M1A2A2940914). This work was also supported by the Energy Demand Management Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (2018201010636A). We thank Hanyang LINC+ Analytical Equipment Center (Seoul).
© 2019 American Chemical Society.
- bulk heterojunction
- morphology engineering
- optical engineering
- polymer solar cells
- processing additive