Enhancement of performance in chlorophyll-based bulk-heterojunction organic-inorganic solar cells upon aggregate management via solvent engineering
Source abstract
Abstract
Abstract Chlorophylls are the most abundant bipolar organic semiconductor found in nature. We demonstrated novel bulk-heterojunction organic-inorganic solar cells (OISCs) in which a carboxylated chlorophyll derivative (H2Chl-1) sensitizing mesoporous TiO2 functioned as an n-type electron acceptor and self-aggregates of zinc chlorophyll (ZnChl-2) functioned as a p-type electron donor. In this work, we employed chloroform (CF), chlorobenzene (CB), and their mixtures as processing solvents to manage the morphology of ZnChl-2 aggregates and the pore-filling of ZnChl-2 into mesoporous TiO2. ZnChl-2 aggregates generated from a mixed solvents (CF:CB = 2:1) exhibited the smallest surface roughness and most efficient charge separation and the power conversion efficiency of OISCs was substantially improved to 2.13%. Importantly, the incident photon-to-current conversion efficiency profiles of these OISCs consisted of the spectral components of both TiO2-attached H2Chl-1 and self-aggregated ZnChl-2, indicating that efficient charge separation can occur at the interface between these two chlorophyll species.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: TiO2 Photocatalysis and Solar Cells · Perovskite Materials and Applications · Organic Electronics and Photovoltaics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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