Chang-Zhi Li

TL;DR: In this article, the authors summarize the latest developments in solution-processed interfacial layers that have contributed to the significantly improved performance of polymer and perovskite solar cells (PSCs and PVSCs).

TL;DR: Through spectroscopic measurements, it is found that electron transfer from the perovskite to the TiO2 in the standard planar junction cells is very slow, so fullerene-modified devices achieve up to 17.3% power conversion efficiency with significantly reduced hysteresis, and stabilized power output reaching 15.7% in the planar p-i-n heterojunction solar cells measured under simulated AM 1.5 sunlight.

TL;DR: In this article, an alloy-like composite is formed between Y6 and a newly designed derivative, BTP-M. Employing an electron-pushing methyl substituent as a replacement for the electron-withdrawing F atoms on Y6, the obtained Y6:BTP-m alloy can simultaneously optimize energy levels to reduce energy loss as well as the morphologies of the active layers to favor photocurrent generation, leading to an enhanced open-circuit voltage (Voc) of 0.875 V together with a larger shortcircuit current density (Jsc

TL;DR: It is shown that the formation of triplet excitons can be the main loss mechanism in organic photovoltaic cells, and that, even when energetically favoured, the relaxation of 3CT states to T1 states can be strongly suppressed by wavefunction delocalization, allowing for the dissociation of 3 CT states back to free charges, thereby reducing recombination and enhancing device performance.

TL;DR: In this article, the development of functional fullerenes as acceptors, electron selective layers, and morphology stabilizers for bulk heterojunction polymer solar cells is reviewed, and a wide variety of newly developed fullerene-derived molecules have appeared in the past few years and started to show very encouraging photovoltaic performance when they were blended with low bandgap conjugated polymers.