Nonfullerene Polymer Solar Cell with Large Active Area of 216 cm² and High Power Conversion Efficiency of 7.7%

Abstract

A polymer solar cell involving a nonfullerene acceptor is made by blade coating. In the ternary bulk‐heterojunction layer, the donor is poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b’]dithiophene))‐co‐(1,3‐di(5‐thiophene‐2‐yl)‐ 5,7‐bis(2‐ethylhexyl)benzo[1,2‐c:4,5‐c’]dithiophene‐4,8‐dione)] (PBDB‐T) and the acceptor is a mixture of 3,9‐bis(2‐methylene‐(3‐(1,1‐dicyanomethylene)‐indanone))‐5,5,11,11‐tetrakis(4‐hexylphenyl)‐dithieno[2,3‐d:2’,3’‐d’]‐s‐indaceno[1,2‐b:5,6‐b’]dithiophene) (ITIC) and [6,6]‐phenyl C71‐butyric acid methyl ester (PC71BM). The device structure is an indium tin oxide (ITO)‐coated glass substrate/PEDOT:PSS/ternary active layer/interfacial layer/Al. For a small active area of 0.04 cm2, the best power conversion efficiency is 9.8% with the LiF interfacial layer. For a large active area of 216 cm2, the best efficiency is 7.7% with the ZrOx interfacial layer. After annealing at 85 °C for 30 days, the large‐area device keeps 75% of the initial efficiency. The efficiency of 4.9% is achieved for a large‐area semi‐transparent device.

Single-Component Non-halogen Solvent-Processed High-Performance Organic Solar Cell Module with Efficiency over 14%

“…[7][8][9][10][11] Although encouraging results are obtained in small-area devices based on NFAs, the efficiencies of module devices still lag far behind. [12][13][14][15][16][17][18] One of the major concerns in constructing large-area modules is the toxicity of processing solvents. Numerous high-performance spin-coated small-area devices were obtained by halogen solvents (e.g., chlorobenzene, chloroform, etc.)…”

Nonhalogenated‐Solvent‐Processed High‐Performance All‐Polymer Solar Cell with Efficiency over 14%

“…Polymer solar cells (PSCs) have attracted considerable interest due to their advantages such as light weight, flexibility, and possible fabrication using low‐cost printing techniques. [ 1–3 ] Compared to PSCs based on fullerene acceptors or nonfullerene small‐molecule acceptors (SMAs), [ 4–6 ] all‐polymer solar cells (all‐PSCs), which utilize conjugated polymers as both the electron–donor and electron–acceptor in the light‐harvesting layer, [ 7,8 ] have attracted growing interest for their outstanding mechanical and thermal stabilities. [ 9–12 ] Recently, the power conversion efficiency (PCE) of all‐PSCs has been significantly boosted to over 15%, primarily due to the substantial efforts devoted to active‐layer material design, [ 13–17 ] device engineering, and bulk heterojunction morphology control, [ 18,19 ] demonstrating a great potential toward future practical application.…”

Ternary Organic Solar Cell with 1750 h Half Lifetime Under Ultraviolet Irradiation with Solar Intensity

“…Blade coating is shown to achieve high performance in large area OPV. [ 28–30 ] In this work, we study the UV stability of OPV by applying the blade coating method for the fabrication process. We select materials to investigate the UV stability including the polymer donors poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl‐3‐fluoro)thiophen‐2‐yl)‐benzo[1,2‐b:4,5‐b′]dithiophene))‐alt‐(5,5‐(1′,3′‐di‐2‐thienyl‐5′,7′‐bis(2‐ethylhexyl)benzo[1′,2′‐c:4′,5′‐c′]dithiophene‐4,8‐dione)] (PM6), and poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene))‐co‐(1,3‐di(5‐thiophene‐2‐yl)‐5,7‐bis(2‐ethylhexyl)benzo[1,2‐c:4,5‐c′]dithiophene‐4,8‐dione)] (PBDB‐T).…”