p-i-n Perovskite Solar Cells on Steel Substrates.

An efficient substrate-configuration p-i-n metal-halide perovskite solar cell (PSC) is fabricated on a polymer-coated steel substrate. The optimized cell employs a Ti bottom electrode coated with a thin indium tin oxide (ITO) interlayer covered with a self-assembled [2-(9-carbazol-9-yl)ethyl]phosphonic acid monolayer as a hole-selective contact. A triple-cation perovskite is used as the absorber layer.

Improving the compatibility of fullerene acceptors with fluorene-containing donor-polymers in organic photovoltaic devices.

Fluorene-containing PCBM analogs have been synthesized and tested with a polyfluorene copolymer, PF10TBT, in organic photovoltaic devices resulting in an increase of ∼130 mV in the open circuit voltage compared to devices with PCBM as acceptor material.

Charge separation and (triplet) recombination in diketopyrrolopyrrole-fullerene triads.

Synthesis and photophysics of two diketopyrrolopyrrole-based small band gap oligomers, end-capped at both ends with C(60) are presented. Upon photoexcitation of the oligomer, ultrafast energy transfer to the fullerene occurs ( approximately 0.5 ps), followed by an electron transfer reaction.

Charge separation and recombination in small band gap oligomer-fullerene triads.

Synthesis and photophysics of a series of thiophene-thienopyrazine small band gap oligomers, end-capped at both ends with C(60), are presented. In these triads, a photoinduced electron transfer reaction occurs between the oligomer as a donor and the fullerene as an acceptor. Femtosecond photoinduced absorption has been used to determine the rates for charge separation and recombination.