Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 88: Organic Electronics and Photovoltaics V: OPV

HL 88.8: Talk

Friday, March 24, 2017, 12:30–12:45, ZEU 255

Overcoming interfacial losses in solution-processed organic multi-junction solar cells — •Xiaoyan Du¹, Ole Lytken¹, Hans-Peter Steinrück¹, Rainer H. Fink¹, Ning Li², and Christoph Brabec² — ¹Physical Chemistry 2 and ICMM Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Egerlandstr. 3, 91058 Erlangen, Germany — ²Institute of Materials for Electronics and Energy Technology (i-MEET) Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) Martensstraße 7, 91058 Erlangen, Germany

We report on a systematic study of interface losses in both single- and multi-junction solar cells based on representative polymer donors and hole transporting layers (HTLs). It is found that a facile mixed HTL containing PEDOT:PSS and MoOx nanoparticles successfully overcomes the interfacial losses in both single- and multi-junction solar cells based on various active layers by reducing interface protonation, promoting better energy-level alignment, and forming a dense and smooth layer. Multi-junction solar cells with different polymers containing nitrogen atoms as the first layer and the mixed PEDOT:PSS and MoOx nanoparticles as HTL reach fill factor (FF) of over 60%, and power conversion efficiency (PCE) of over 8% [1], while the identical stack with pristine PEDOT:PSS or MoOx nanoparticles show significantly lower performance. This work is funded by the DFG within GRK 1896. [1] X. Du, et.al, Adv. Energy Mater. 2016, DOI:10.1002/aenm.201601959