Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 22, Pages 25075-25080Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c02063
Keywords
Si/organic hybrid solar cells; non polar solvent; vertical morphology; XPS depth profiling; passivation
Funding
- Natural Science Foundations of China [51503228]
- Fundamental Research Funds for the Central Universities
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology)
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The optical and electrical properties of the blending organic film poly(3,4-ethylenedioxy-thiophene):poly(styrenesulfonate) (PEDOT:PSS) are strongly affected by its morphology, resulting in the performance variation in Si/organic hybrid solar cells. Here, a facile postsolvent treatment is used to tailor the vertical morphology of PEDOT:PSS by introducing a nonpolar solvent. X-ray photoelectron spectroscopy depth-profiling measurements show that the distribution of PEDOT and PSS on the surface of n-type Si can be changed by nonpolar solvent n-hexane (NHX) treatment, where more PSS aggregate at the bottom of the blend film and more PEDOT float up to the top, as compared with the reference sample. As a result, after NHX treatment, the average lifetime of the Si/organic films is increased from 152 mu s for untreated samples to 248 mu s for NHX-treated ones because of the better passivation effect of PSS on Si. Moreover, the transmission line model measurements indicate that the contact resistance (R-C) of PEDOT:PSS film and the Ag electrode is decreased for better charge collection after NHX treatment. Eventually, the best power conversion efficiency (PCE) of 13.78% for NHX-treated planar solar cells is obtained, much higher than the PCE (with best of 12.78%) of reference devices without nonpolar solvent treatment. Our results provide a facile method to tailor the vertical morphology of the PEDOT:PSS in Si/organic hybrid solar cells.
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