Improved Performance of All‐Polymer Solar Cells Enabled by Naphthodiperylenetetraimide‐Based Polymer Acceptor

Abstract

A new polymer acceptor, naphthodiperylenetetraimide-vinylene (NDP-V), featuring a backbone of altenating naphthodiperylenetetraimide and vinylene units is designed and applied in all-polymer solar cells (all-PSCs). With this polymer acceptor, a new record power-conversion efficiencies (PCE) of 8.59% has been achieved for all-PSCs. The design principle of NDP-V is to reduce the conformational disorder in the backbone of a previously developed high-performance acceptor, PDI-V, a perylenediimide-vinylene polymer. The chemical modifications result in favorable changes to the molecular packing behaviors of the acceptor and improved morphology of the donor-acceptor (PTB7-Th:NDP-V) blend, which is evidenced by the enhanced hole and electron transport abilities of the active layer. Moreover, the stronger absorption of NDP-V in the shorter-wavelength range offers a better complement to the donor. All these factors contribute to a short-circuit current density (J ) of 17.07 mA cm . With a fill factor (FF) of 0.67, an average PCE of 8.48% is obtained, representing the highest value thus far reported for all-PSCs.

Polymer Donors for High‐Performance Non‐Fullerene Organic Solar Cells

“…Theactive layer containing PTB7-Tha nd FOIC displayed strong NIR absorption but weak visible absorption, and therefore could sufficiently harvest NIR light to attain high PCE, while simultaneously retaining high visible transparency. [46] Recently,ahigher PCE of 8.6 %w as attained in all-polymer organic solar cells also employing PTB7-Thw ith aP DI-based polymer acceptor NDP-V. [47] Another ST-OSC system was developed through mixing PTB7-Thw ith aN IR-absorbing chlorinated non-fullerene acceptor,B T-CIC.…”

Effects of Bithiophene Imide Fusion on the Device Performance of Organic Thin‐Film Transistors and All‐Polymer Solar Cells

“…Then ormalized UV/ Visabsorption spectra of f-BTI2-FT and s-BTI2-FT are shown in Figure 2a.s-BTI2-FT exhibits light absorption in the visible range (400-630 nm) with an absorption onset at 627 nm, resulting in an optical band gap (E g opt )o f1 .98 eV in the film (see Table S1 in the Supporting Information). [26] From solution to afilm, both s-BTI2-FT and f-BTI2-FT show nearly identical absorption, thus indicating their strong aggregation in solution. [26] From solution to afilm, both s-BTI2-FT and f-BTI2-FT show nearly identical absorption, thus indicating their strong aggregation in solution.…”

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.…”