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Exploiting Ternary Blends to Accurately Control the Coloration of Semitransparent, Non‐Fullerene, Organic Solar Cells
Author(s) -
An Na Gyeong,
Lee Taeho,
Heo Jungwoo,
Kim Jae Won,
Song Seyeong,
Lee Woojin,
Walker Bright,
Lim Eunhee,
Kim Jin Young
Publication year - 2021
Publication title -
solar rrl
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.544
H-Index - 37
ISSN - 2367-198X
DOI - 10.1002/solr.202000742
Subject(s) - cyan , chromaticity , materials science , organic solar cell , indigo carmine , optoelectronics , fullerene , band gap , rgb color model , ternary operation , absorption (acoustics) , optics , computer science , chemistry , polymer , nuclear chemistry , composite material , physics , organic chemistry , operating system , programming language
Semitransparent organic solar cells (STOSCs) have received increasing attention due to promising applications such as building‐integrated photovoltaics. Successful commercialization requires that STOSCs are aesthetically pleasing as well as having balanced power conversion efficiencies (PCEs) and average visible transmittances (AVTs). Non‐fullerene acceptors, which possess excellent electrical/chemical properties, have helped STOSCs to achieve high PCE and AVT; however, research related to modulating color and appearance of STOSCs has lagged behind. Herein, narrow bandgap donor and acceptor (PTB7‐Th and IEICO‐4F) and ultra‐wide bandgap acceptors (T2‐ORH and T2‐OEHRH) are used to achieve semitransparency and controllable device coloration. Blend films with controllable colors including cyan → blue → purple → reddish purple colors are successfully demonstrated, which are controlled by ratios of IEICO‐4F:T2‐ORH or IEICO‐4F:T2‐OEHRH with PTB7‐Th. By incorporating semitransparent electrodes (comprising Sb 2 O 3 /Ag/Sb 2 O 3 ), STOSCs with PCEs of 6–7% are achieved for cyan, aqua, indigo, and purple and ≈4% PCEs for reddish‐purple colors, with AVTs in the range of 23–35%. Moreover, optical properties of blend films are studied via absorption and transmission measurements, whereas the range of colors achieved is quantified using commission internationale de l'éclairage (CIE) chromaticity and CIE L * a * b * color space then represented as RGB color models.