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PCP-Na is a “self-doped” polymer interlayer with an anionic pendant groups and a conjugated backbone. It is hole selective and can be used to modify the work function of the anode in an organic photovltaic cell. Modifying the work function of the anode in this way can have a positive impact on OPV device characteristics due to the reduction of energetic barriers at the BHJ/anode interface. (1)

When PCP-Na is used as the interlayer in perovskite solar cells, the charge collection at the
perovskite / HTL interface can be improved due to the higher work function of PCP-Na vs. PEDOT:PSS which results in better energetic alignment at the perovskite / HTL interface. (2)

Useful References:

(1) Cui, Y., Jia, G., Zhu, J., Kang, Q., Yao, H., Lu, L., Xu, B., and Hou, J. The Critical Role of Anode Work Function in Non-Fullerene Organic Solar Cells Unveiled by Counterion-Size-Controlled Self-Doping Conjugated Polymers. Chemistry of Materials 2018 30 (3), 1078-1084. DOI: 10.1021/acs.chemmater.7b04982

(2)Wang, Q.; Shao, S.; Xu, B.; Duim, H.; Dong, J.; Adjokatse, S.; Portale, G.; Hou, J.; Saba, M.; Loi, M. A. Impact of the Hole Transport Layer on the Charge Extraction of Ruddlesden–Popper Perovskite Solar Cells. ACS Appl. Mater. Interfaces 2020, 12 (26), 29505–29512. DOI: 10.1021/acs.chemmater.7b04982

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