The performance of methylammonium lead triiodide (CH3NH3PbI3)‐based solar cells depends on the crystallization and controlled microstructure. Despite their high performance, long‐term stability is a paramount factor toward large area fabrication and potential industrialization. Herein, poly(vinylidene fluoride–trifluoro ethylene) (P(VDF‐TrFE)) is used as an additive into a low concentration–based perovskite precursor solution to control the crystallinity and microstructure. Perovskite layers of lower thicknesses are derived from low precursor concentration, however, they often suffer from severe voids and roughness. Introducing judicious quantities of P(VDF‐TrFE) improves the surface coverage and smoothness, as well as reduce the grain boundaries in the perovskite. An array of characterization techniques are used to probe the structural, microstructural, and spectroscopic properties. Impedance spectra suggest that the P(VDF‐TrFE) can improve the carrier lifetime and reduce the charge transfer resistance, which in turn allows improvment of photovoltaic performance. For an optimized concentration of P(VDF‐TrFE), the fabricated semitransparent solar cells yield a power conversion efficiency in excess of 10%, which supersedes pristine devices, along with improved stability. The device architecture and the fabrication technique provide an effective route to fabricate cost effective and visible‐light‐semitransparent perovskite solar cells.
<p>The performance of methylammonium
lead triiodide (CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub>) based solar cells
depends on its crystallization and controlled microstructure. In spite of its
high performance, long-term stability is a paramount factor towards its large
area fabrication and potential industrialization. Herein, we have employed poly(vinylidene
fluoride−trifluoro ethylene) P(VDF-TrFE)
as an additive into a low concentration based perovskite precursor solutions to
control the crystallinity and microstructure. Perovskite layers of lower
thickness can be derived from low precursor concentration, however it often
suffers from severe voids and roughness. Introducing judicious quantities of
P(VDF-TrFE) can improve the surface coverage, smoothness as well as reduces the
grain boundaries in the perovskite. An array of characterization techniques
were utilized to probe the structural, microstructural and spectroscopic
properties. Impedance spectra suggests, the P(VDF-TrFE) can improve the carrier
lifetimes and reduce the charge transfer resistance, which in turn allows to improve
photovoltaic performance. For an optimized concentration of P(VDF-TrFE), the
fabricated semi-transparent solar cells yielded power conversion efficiency in
excess of 10%, which supersede pristine devices along with improved stability.
The device architect and the fabrication technique provide an effective route to
fabricate cost effective and visible-light-semi-transparent perovskite solar
cells.</p>
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