Inverted Polymer Solar Cells with Annealing-Free Solution-Processable NiO
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- Inverted Polymer Solar Cells with Annealing-Free Solution-Processable NiO
- Tran, Hong Nhan; Dao, Duc Quang; Yoon, Yung Jin; Shin, Yun Seop; Choi, Jin San; Kim, Jin Young; Cho, Shinuk
- Issue Date
- WILEY-V C H VERLAG GMBH
- SMALL, pp.2101729
- Nickel oxide (NiO) offers intrinsic p-type behavior and high thermal and chemical stability, making it promising as a hole transport layer (HTL) material in inverted organic solar cells. However, its use in this application has been rare because of a wettability problem caused by use of water as base solvent and high-temperature annealing requirements. In the present work, an annealing-free solution-processable method for NiO deposition is developed and applied in both conventional and inverted non-fullerene polymer solar cells. To overcome the wettability problem, the typical DI water solvent is replaced with a mixed solvent of DI water and isopropyl alcohol with a small amount of 2-butanol additive. This allows a NiO nanoparticle suspension (s-NiO) to be deposited on a hydrophobic active layer surface. An inverted non-fullerene solar cell based on a blend of p-type polymer PTB7-Th and non-fullerene acceptor IEICO-4F exhibits the high efficiency of 11.23% with an s-NiO HTL, comparable to the efficiency of an inverted solar cell with a MoOx HTL deposited by thermal evaporation. Conventionally structured devices including this s-NiO layer show efficiency comparable to that of a conventional device with a PEDOT:PSS HTL.
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