ArticleACS applied materials & interfaces2020
Organic Salts as p-Type Dopants for Efficient LiTFSI-Free Perovskite Solar Cells.
Article in ACS applied materials & interfaces, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed, 30 citations in OpenAlex.
- Strain, Chain, Repeat: Synthesis and Optoelectronic Properties of Poly(Naphthalene Benzene Vinylene)s.ACS macro letters · 2026Article
- Hybrid Thin-Film Materials Combinations for Complementary Integration Circuit Implementation.Membranes · 2021Review
- An organic hole-transporting material spiro-OMeTAD doped with a Mn complex for efficient perovskite solar cells with high conversion efficiency.RSC advances · 2021Article
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Authors and funding
10 authors at 3 institutions in 2 countries.
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Abstract
Despite the ubiquity and importance of organic hole-transport materials in photovoltaic devices, their intrinsic low conductivity remains a drawback. Thus, chemical doping is an indispensable solution to this drawback and is essentially always required. The most widely used p-type dopant, FK209, is a cobalt coordination complex. By reducing Co(III) to Co(II), Spiro-OMeTAD becomes partially oxidized, and the film conductivity is initially increased. In order to further increase the conductivity, the hygroscopic co-dopant LiTFSI is typically needed. However, lithium salts are normally quite hygroscopic, and thus, water absorption has been suggested as a significant reason for perovskite degradation and therefore limited device stability. In this work, we report a LiTFSI-free doping process by applying organic salts in relatively high amounts. The film conductivity and morphology have been studied at different doping amounts. The resulting solar cell devices show comparable power conversion efficiencies to those based on conventional LiTFSI-doped Spiro-OMeTAD but show considerably better long-term device stability in an ambient atmosphere.
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