The compromise between power conversion efficiency (PCE) and average visible transmittance (AVT) poses a big challenge for high performance semitransparent organic solar cells (ST-OSCs). Herein, a molecular weight-regulated efficient sequential deposition (SD) strategy is first employed to improve the performance of ST-OSCs. A series of narrow bandgap (NBG) polymer donors PCE10-2F with different molecular weights have been synthesized. A molecular weight-regulated SD strategy has been discovered to fine-tune the crystallinity of the polymers, not only favoring the formation of a dense and robust film, but also reasonably adjusting the compatibility of donors/acceptors to enhance interfacial contact. Thanks to the favorable morphology, efficient charge dynamics, and suppressed energy loss, a record PCE of 14.53% is obtained for the PCE10-2F/Y6 all-NBG materials-based opaque device. Optical simulations reveal that the SD process favors a convenient and precise control of individual layers for the optimization of light transmission. The corresponding ST-OSC achieves a breakthrough PCE of 11.11-10.01% with a high AVT of 39.93-50.05%. A champion light utilization efficiency (LUE) of 5.01% is achieved for ST-OSCs without complex optical engineering, demonstrating the successful balance of PCE and AVT. These results demonstrate that the molecular weight-regulated SD method is a facile and promising strategy for highly efficient ST-OSCs.
Bibliographical noteFunding Information:
L. C. thanks for the support from the National Natural Science Foundation of China (NSFC) (51973087 and 52173170), the Thousand Talents Plan of Jiangxi Province (jxsq2019201004) and the Natural Science Foundation of Jiangxi Province (20212ACB203010). F. W. thanks for the support from the National Natural Science Foundation of China (NSFC) (22169012).
© 2022 The Royal Society of Chemistry.
ASJC Scopus subject areas
- Environmental Chemistry
- Renewable Energy, Sustainability and the Environment
- Nuclear Energy and Engineering