In:
Solar RRL, Wiley, Vol. 3, No. 12 ( 2019-12)
Abstract:
One of the attractive ways to develop efficient and cost‐effective inverted perovskite solar cells (PVSCs) is through the use of dopant‐free hole transporting materials (HTMs) with facile synthesis and a lower price tag. Herein, two organic small molecules with a fluorene core are presented as dopant‐free HTMs in inverted PVSCs, namely, FB‐OMeTPA and FT‐OMeTPA. The two molecules are designed in such a way they differ by replacing one of the benzene rings (FB‐OMeTPA) with thiophene (FT‐OMeTPA), which leads to a significantly improved coplanarity as manifested in the redshift of the absorbance and a smaller bandgap energy. Density functional theory calculations show that FT‐OMeTPA has a strong Pb 2+ –S interaction at the FT‐OMeTPA/perovskite interface, allowing surface passivation and facilitating charge transfer across interfaces. As a result, the PVSCs based on FT‐OMeTPA exhibit a much higher hole mobility, power conversion efficiency, operational stability, and less hysteresis as compared with devices based on FB‐OMeTPA.
Type of Medium:
Online Resource
ISSN:
2367-198X
,
2367-198X
DOI:
10.1002/solr.201900319
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
2882014-9