The power conversion efficiency (PCE) of Cs 2 AgBiBr 6 -based perovskite solar cells (PSCs) is still low owing to the inherent defects of Cs 2 AgBiBr 6 films. Herein, we demonstrate a carboxy-chlorophyll derivative (C-Chl)-sensitized mesoporous TiO 2 (m-TiO 2 ) film as an electron transport layer (ETL) to enhance and extend the absorption spectrum of Cs 2 AgBiBr 6 -based PSCs. The C-Chl-based device achieves a significantly improved PCE, exceeding 3% for the first time, with an increase of 27% in short-circuit current density. Optoelectronic investigations confirm that the introduction of C-Chl reduces the defects, accelerates the electron extraction, and suppresses charge recombination at the interface of ETL/perovskite. Moreover, the unencapsulated PSCs display restrained hysteresis and great stability under ambient conditions.
A program for applying two-dimensional NMR spectroscopic data from
1H−13C COSY (one-bond C−H
correlations)/H−1H COSY (three bond H−H
correlations) and 2D-INADEQUATE (one-bond C-C
correlations) experiments has been developed and introduced into
CHEMICS. The main concepts employed
in this study consists of making a more accurate assignment of
13C and 1H chemical shifts to carbons
and
hydrogens in the sample structure at the data analysis step in CHEMICS
followed by the generation of
more probable structures as candidates using
13C−13C and 1H−1H
coupling information. The detailed
algorithm are described. In addition, current configuration of
CHEMICS including peripheral functions for
examination of candidates by mass and 13C-NMR spectral
prediction and the brief overview are described.
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