Nucleation and Crystallization Control via Polyurethane to Enhance the Bendability of Perovskite Solar Cells with Excellent Device Performance

Abstract

Solar cells based on mixed organic-inorganic halide perovskites are promi sing photovoltaic technologies with lowcost and fantastic power conversion efficiency (PCE). Enhancing the nucleation and regulating the crystallization rate of perovskite films and improving the bendability of brittle hybrid grains are crucial to improving the photovoltaic performance of flexible perovskite solar cells (PVSCs). Here, a simple approach is first introduced for fabricating perovskite films with full coverage and larger crystalline size by incorporating the elastomer polyurethane (PU) into the perovskite precursor solution to both retard the crystallization rate and improve the bendability. Shiny, smooth perovskite films are obtained with compact, micrometersized crystalline grains that exhibit excellent photoelectric performances. The PVSCs fabri cated by incorporating PU into the perovskite precursor offer an impressive PCE of 18.7% with almost no photocurrent hysteresis and excellent stability in ambient air. More importantly, the elastomer PU additive crosslinks the grain boundaries between neighboring perovskite crystals to form a PU net work that effectively improves the bendability of the perovskite films.

Efficient Inverted Planar Perovskite Solar Cells Using Ultraviolet/Ozone‐Treated NiOx as the Hole Transport Layer

“…The structure of FTO/UVO‐NiO x /MAPbI 3 exhibits a τ a of 4.7 ns, which is much smaller than 7.8 ns of the control sample (FTO/ NiO x /MAPbI 3 ), suggesting a faster hole extraction from the perovskite layer to NiO x film with UVO treatment. The large grain size provides greater PL intensity and longer carriers lifetime (TRPL) according to some published literatures . However, there's also another factor that influence these properties, i.e., the charge transfer from the perovskite to the substrate, which could be induced by charge collection and transport efficiencies .…”

Flexible and Stretchable Perovskite Solar Cells: Device Design and Development Methods

“…As discussed above, the flexibility of FPSCs can be dramatically enhanced by employing TCO‐free electrodes and ultrathin polymer substrates. However, the bending tolerance is expected to be enhanced further with rational structure design, or polymer or organic–inorganic composite functional layers (perovskite layer and charge‐transporting layers) . Song and co‐workers introduced a nanocellular scaffold in a PEDOT:PSS electrode as a mechanical buffer layer.…”

Efficient Passivation with Lead Pyridine‐2‐Carboxylic for High‐Performance and Stable Perovskite Solar Cells

“…[30][31][32] Our group employed in-situ cross-linking methods to stitch GBs and significantly enhanced operational and moisture stability. [35] However, these organic additives contribute the weak interactions (intermolecular force or hydrogen bond) with composition around GBs. [35] However, these organic additives contribute the weak interactions (intermolecular force or hydrogen bond) with composition around GBs.…”