All‐Polymer Solar Cells Based on a Conjugated Polymer Containing Siloxane‐Functionalized Side Chains with Efficiency over 10%

Abstract

A novel wide-bandgap conjugated copolymer based on an imide-functionalized benzotriazole building block containing a siloxane-terminated side-chain is developed. This copolymer is successfully used to fabricate highly efficient all-polymer solar cells (all-PSCs) processed at room temperature with the green-solvent 2-methyl-tetrahydrofuran. When paired with a naphthalene diimide-based polymer electron-acceptor, the all-PSC exhibits a maximum power conversion efficiency (PCE) of 10.1%, which is the highest value so far reported for an all-PSC. Of particular interest is that the PCE remains 9.4% after thermal annealing at 80 °C for 24 h. The resulting high efficiency is attributed to a combination of high and balanced bulky charge carrier mobility, favorable face-on orientation, and high crystallinity. These observations indicate that the resulting copolymer can be a promising candidate toward high-performance all-PSCs for practical applications.

Modulating the Symmetry of Benzodithiophene by Molecular Tailoring for the Application in Naphthalene Diimide‐Based N‐Type Photovoltaic Polymers

“…In particular, in 2016, Li et al selected a medium bandgap benzodithiophene‐ alt ‐benzotriazole copolymers with fluorine substitution (J51) as the donor polymer and N2200 as the acceptor polymer to fabricate all‐PSCs and achieved a much higher PCE of 8.27% . Very recently, Huang et al adopted a wide‐bandgap polymer of poly{(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene‐co‐4,8‐di(thien‐2‐yl)‐2‐(6‐(1,1,1,3,5,5,5‐heptamethyltrisiloxan‐3‐yl)hexyl)‐6‐octyl[1,2,3]triazolo[4,5‐f]isoindole‐5,7(2H,6H)‐dione} (PTzBI‐Si) and achieved the highest PCE of 10.1%, which is also the highest value for all‐PSCs to date, showing the large potential for the NDI‐based photovoltaic polymers …”

Dye‐Incorporated Polynaphthalenediimide Acceptor for Additive‐Free High‐Performance All‐Polymer Solar Cells

“…[1][2][3] Thep ower conversion efficiency (PCE) of single-junction fullerene-based PSCs has been attained over 11 %. [8][9][10][11][12][13][14][15][16] Forp ractical applications,t he morphological stability of the all-PSCs against the mechanical and thermal stresses is beneficial for applications in flexible large-scale and stable devices.Although the PCE of all-PSCs has reached 10 %, [15] the performance of all-PSCs still lag behind that of state-of-theart small-molecule-based devices,o wing to the lack of suitable n-type polymer acceptors.T od ate,t he number of polymer acceptors developed for all-PSCs are limited, and only five studies have reported all-PSCs with ap hotovoltaic efficiency over 8% for ab inary system. [5][6][7] Regarding fullerene-based and fused-ring electron acceptor-based devices,a ll-polymer solar cells (all-PSCs) composed of ac onjugated polymer donor and an n-type conjugated polymer offer unique attractions due to their special advantages of morphological stability and flexibility.…”

“…[4] Recently,P CEs exceeding 13 % have been achieved with proper molecular designs of wideband-gap polymer donors and fused-ring electron acceptors. [8][9][10][11][12][13][14][15][16] Forp ractical applications,t he morphological stability of the all-PSCs against the mechanical and thermal stresses is beneficial for applications in flexible large-scale and stable devices. [8][9][10][11][12][13][14][15][16] Forp ractical applications,t he morphological stability of the all-PSCs against the mechanical and thermal stresses is beneficial for applications in flexible large-scale and stable devices.…”

“…[12][13][14][15][16] Among the polymer acceptors reported, naphthalene diimide (NDI)based acceptors,such as poly[[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl-alt]-5,5'-(2,2'bithiophene)] (N2200), are the most prominent one due to the advantages of suitable energy levels,h igh electron mobility, and good solubility. [14][15][16][17][18][19][20] However, N2200 suffers from apoor absorption coefficient in films,which limits the photocurrent and efficiency improvement. On the other hand, the high crystallinity of N2200 results in high charge mobility.…”

Organic Photovoltaics over Three Decades

“…It was with the quite recent development with new combinations of polymers, and new electron acceptor transporting polymers, that this field started to move. [243] We have spent some studies on combinations of the TQ1 polymer with N2200 acceptors, [244] similar to the study of Mori et al, [239] but with lower performance. [243] We have spent some studies on combinations of the TQ1 polymer with N2200 acceptors, [244] similar to the study of Mori et al, [239] but with lower performance.…”