A 2.20 eV Bandgap Polymer Donor for Efficient Colorful Semitransparent Organic Solar Cells

Abstract

Semitransparent organic solar cells (ST-OSCs) have attracted increasing attention due to their promising prospect in building-integrated photovoltaics. Generally, efficient ST-OSCs with good average visible transmittance (AVT) can be realized by developing active layer materials with light absorption far from the visible light range. Herein, the development of ultrawide bandgap polymer donors with near-ultraviolet absorption, paired with nearinfrared acceptors, is proposed to achieve high-performance ST-OSCs. The key points for the design of ultrawide bandgap polymers include constructing donor-donor type conjugated skeleton, suppressing the quinoidal resonance effect, and minimizing the twist of conjugated skeleton via noncovalent conformational locks. As a proof of concept, a polymer named PBOF with an optical bandgap of 2.20 eV is synthesized, which exhibited largely reduced overlap with the human eye photopic response spectrum and afforded a power conversion efficiency (PCE) of 16.40% in opaque device. As a result, ST-OSCs with a PCE over 10% and an AVT over 30% are achieved without optical modulation. Moreover, colorful ST-OSCs with visual aesthetics can be achieved by tuning the donor/acceptor weight ratio in active layer benefiting from the ultrawide bandgap nature of PBOF. This study demonstrates the great potential of ultrawide bandgap polymers for efficient colorful ST-OSCs.

A 3‐Fluoropyridine Manipulating the Aggregation and Fibril Network of Donor Polymers for Eco‐Friendly Solution‐Processed Versatile Organic Solar Cells

“…All batches obtained with the polymerization time of over 36 h can provide an efficiency of ≈16% (Figure S14 and Table S9, Supporting Information). [ 8,13,31,32,42 ]…”

Semi-transparent organic solar cells based on large bandgap star-shaped small molecules as mixed donors with PM6

“…In recent work, the application of a wide bandgap polymer (2.20 eV) in ternary ST-OSCs gave a best performing device with a PCE of 10.01% and AVT of 30.48%. 30 Given that there was only a 30% to 40% transmittance loss after depositing the ultrathin metal transparent electrode (UMTE), [31][32][33] the estimated AVT after depositing UMTE for star-shaped BFN and BFSN in ternary ST-OSCs as wide bandgap materials has provided device characteristics that are very competitive in the field.…”

Synergy of the transmittance fluctuation factor and absorption selectivity for efficient semitransparent perovskite/organic tandem solar cells with high color-fidelity

“…The rst relates to the trade-off between harnessing solar energy and acquiring visible transparency, which is quantied based on the power conversion efficiency (PCE) versus average visible transmittance (AVT). 9 To solve this challenge of ST-OSCs, tremendous efforts have been focused on the thickness compromise of the absorber layer, designing materials with strong near-infrared (NIR) absorption and introducing aperiodic dielectric reectors and so on. [10][11][12] Richard proposed the light utilization efficiency (LUE) to assess its performance (LUE = PCE × APT, where APT is the average photopic transmission).…”