Solid Additive Dual‐Regulates Spectral Response Enabling High‐Performance Semitransparent Organic Solar Cells

Abstract

Semi‐transparent organic solar cells (ST‐OSCs) possess significant potential for applications in vehicles and buildings due to their distinctive visual transparency. Conventional device engineering strategies are typically used to optimize photon selection and utilization at the expense of power conversion efficiency (PCE); moreover, the fixed spectral utilization range always impose an unsatisfactory upper limit to its light utilization efficiency (LUE). In this study, a novel solid additive 1,3‐diphenoxybenzene (DB) has been employed to dual‐regulate donor/acceptor molecular aggregation and crystallinity, which effectively broadens the spectral response of resulting device in near‐infrared region. Besides, more visible light was allowed to pass through the devices, which enables ST‐OSCs to possess satisfactory photocurrent and high average visible transmittance (AVT) simultaneously. The inclusion of DB also results in a multi‐scale phase‐separated morphology and effectively suppresses voltage losses. Consequently, the optimal ST‐OSCs based on PP2+DB/BTP‐eC9+DB achieves a superior LUE of 4.77%, with an AVT of 42.98% and a PCE of 11.10%, representing the highest value within AVT range of 40–50% observed thus far. Such results indicate that the ST‐OSCs can simultaneously meet the requirements for minimum commercial efficiency and plant photosynthesis when integrated with the roofs of agricultural greenhouses. This work emphasizes the significance of additives to tune the spectral response in ST‐OSCs, and charts the way for organic photovoltaics in economically sustainable agricultural development.This article is protected by copyright. All rights reserved

Polythiophene and its derivatives for all-polymer solar cells

“…Organic solar cells (OSCs) are gaining momentum owing to their affordability, exibility, and light weight. [1][2][3][4][5][6][7] Among them, allpolymer solar cells (all-PSCs), 8 whose active layer comprises conjugated polymer donors and conjugated polymer acceptors, offer advantages such as excellent mechanical ductility, device stability, and compatibility with roll-to-roll manufacturing technology. [9][10][11][12][13][14][15][16][17][18] The power conversion efficiency (PCE) of highperformance OSCs is rapidly exceeding 20%, propelled by breakthroughs in molecular design and device optimization.…”