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

Abstract

A non-fullerene acceptor (DTY6) with long-branched alkyl chains was synthesized and showed a power conversion efficiency (PCE) of 16.1% when using a nonhalogen solvent. Encouragingly, the large-area modules (18 cm 2) exhibited an outstanding PCE of 14.4% (certified to be 13.98% by a third-party accredited institute), which is by far the highest module efficiency reported to date.

Improving Photovoltaic Performance of Non‐Fullerene Polymer Solar Cells Enables by Fine‐Tuning Blend Microstructure via Binary Solvent Mixtures

“…However, in some cases, many morphology control strategies, like SVA and TA treatments, are not useful for the possible large‐scale fabrication in industry scenarios. [ 41,42 ] As expected, development of appropriate approaches to improve the printed film formation, BHJ morphology, and composition distribution for blend films is of great significance and urgent, especially under the background that the efficiency of the currently reported photovoltaic systems has basically met commercial requirements. [ 43,44 ]…”

“…However, in some cases, many morphology control strategies, like SVA and TA treatments, are not useful for the possible large-scale fabrication in industry scenarios. [41,42] As expected, development of appropriate approaches to improve the printed film formation, BHJ morphology, and composition distribution for blend films is of great significance and urgent, especially under the background that the efficiency of the currently reported photovoltaic systems has basically met commercial requirements. [43,44] Among the above-mentioned strategies, binary solvent mixture (like chlorobenzene (CB)/1,8-diiodooctance (DIO) and chloroform (CF)/1-chloronaphthalene (CN) binary solvents), which has been successfully used in morphology control in fullerene and non-fullerene based OSCs, [41,[45][46][47][48] is one effective and very simple approach to fine-tune the composition distribution of active layers.…”

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

“…These results indicate that excessive PJ1 aggregation does exist in the blend films and that a high coating speed can suppress this aggregation. Indeed, strong aggregation of Y‐series SMAs has been observed in high‐boiling‐point solvent‐processed devices, [ 26,36 ] and therefore, the relatively strong aggregation ability of PJ1 inherited from Y‐series SMAs is reasonable.…”

“…[ 13,16,25 ] However, halogenated solvents are highly toxic and detrimental to human health and the environment, and thus might be excluded from being the ideal choices of processing solvents for large‐scale manufacturing. [ 26,27 ] One approach to address these issues is nanoparticle ink technology, wherein the donor and acceptor are combined to prepare alcohol‐ or water‐processable nanoparticles. [ 28,29 ] However, these devices may exhibit low stability and poor PCEs in the presence of nonconductive surfactants.…”

Developing Halogen‐Free Polymer Donors for Efficient Nonfullerene Organic Solar Cells by Addition of Highly Electron‐Deficient Diketopyrrolopyrrole Unit

“…In recent years, bulk‐heterojunction (BHJ) organic solar cells (OSCs) have taken a leap forward based on polymer donors and acceptor–donor–acceptor (A–D–A)‐type nonfullerene acceptors (NFAs). [ 1–16 ] More recently, Y‐system NFA‐based single‐junction OSCs (denoted as NF‐OSCs hereafter) have demonstrated the power conversion efficiencies (PCEs) approaching 18%, [ 17–27 ] showing a great potential toward future commercialization. However, matching polymer donors with high‐performance NFAs are reported thus far to mostly fall within those benzodithiophene (BDT)‐based polymer donors that are flanked with electronegative halogen atoms such as fluorine (F) and chlorine (Cl), representative of PM6, i.e., poly[1‐(5‐(4,8‐bis(5‐(2‐ethylhexyl)‐4‐fluorothiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophen‐2‐yl)thiophen‐2‐yl)‐5,7‐bis(2‐ethylhexyl)‐3‐(thiophen‐2‐yl)‐4H,8H‐benzo[1,2‐c:4,5‐c′]dithiophene‐4,8‐dione] bearing –F side group.…”