Cs2SnIxCl6−x perovskites were synthesized using hydriodic acid as an iodine source, and the color scheme displays a tunable band gap with varying I−/Cl− ratios.

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A new mid-bandgap nonfullerene acceptor, FPIC, is designed and synthesized on the basis of a novel fused-pyrene electron-donating core. FPIC exhibits intense light absorption between 500 and 750 nm, with a maximum molar extinction coefficient of 2.3 × 105 M–1 cm–1 at 645 nm, a medium optical bandgap of 1.63 eV, and a high electron mobility of 1.7 × 10–3 cm2 V–1 s–1. The ternary blend organic solar cells (OSCs) consisting of low-bandgap donor PTB7-Th, ultra-narrow-bandgap nonfullerene acceptor F8IC, and FPIC yield a high power conversion efficiency (PCE) of 13.0%, significantly surpassing the PCE value of the PTB7-Th/F8IC binary blend OSCs (9.55%). The ternary blend exhibits complementary absorption, effective exciton dissociation, balanced charge transport, and reduced charge recombination, leading to the improvement in open-circuit voltage, short-circuit current density, and fill factor relative to those of its PTB7-Th/F8IC counterpart. This work indicates that the mid-bandgap fused-pyrene electron acceptor FPIC is a promising third component for enhancing the photovoltaic performance of low-bandgap donor/acceptor binary blends.

Quantum squeezing, as a typical quantum effect, is an important resource for many applications in quantum technologies. Here we propose a scheme for generating quantum squeezing, including the ponderomotive squeezing and the mechanical squeezing, in an optomechanical system, in which the radiation-pressure coupling and the mechanical spring constant are modulated periodically. In this system, the radiation-pressure interaction can be enhanced remarkably by the modulation-induced mechanical parametric amplification. Moreover, the effective phonon noise can be suppressed completely by introducing a squeezed vacuum reservoir. This ultimately leads to that our scheme can achieve a controllable quantum squeezing. Numerical calculations show that our scheme is experimentally realizable with current technologies.

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