Journal
ORGANIC ELECTRONICS
Volume 69, Issue -, Pages 56-61Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2019.03.010
Keywords
Spontaneous spreading; Electron acceptors; Electron-transporting layer; Organic solar cells
Funding
- National Natural Science Foundation of China [91233205, 20774099, 21574013, 51673028]
- Program for Changjiang Scholars and Innovative Research Team in University
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Although metal oxides such as ZnO are frequently used in inverted polymer solar cells (PSCs) to serve as an electron-transporting layer, how to effectively improve its interface with the photoactive layer is still an open question. In this study, we exploited small-molecule (SM) compounds usually used as electron acceptors in PSCs to act as an interlayer on ZnO and constructed an SM/ZnO double electron-transporting layer to improve the device's photovoltaic performance. To avoid the solvent erosion to SM interlayer during the deposition of upper-lawyer film, spontaneously-spreading-film technique was employed to prepare the photoactive layer. We used two SM acceptors (ITIC and IDT-BOC6) with different energy levels to serve as the interlayer. Results show that devices based on ITIC interlayer, which has similar LUMO level with materials in its adjacent layers, possess a better electron-transporting ability than IDT-BOC6 based ones which lack of such an energy-level structure. Moreover, SM interlayer is beneficial to flatten the interface and improves the contact between the electron-transporting layer and the photoactive layer. Consequently, we demonstrate a new way to improve the collection of electrons in PSCs by using commonly available electron acceptors, which provides a large choosability in interfacial materials.
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