Chlorinated Fused Nonacyclic Non-Fullerene Acceptor Enables Efficient Large-Area Polymer Solar Cells with High Scalability

Abstract

As the power conversion efficiency (PCE) of polymer solar cells (PSCs) keeps increasing, developing high-performance large-area PSCs toward commercial application becomes a hot topic in this field. Here, we design and synthesize a non-fullerene acceptor TfIF-4Cl with a fused nonacyclic core via end-group chlorination. Compared to the fluorinated counterpart (TfIF-4F), the combination of the Cl atom in TfIF-4Cl not only leads to red-shifted absorption, but also improves the molecular packing ability. When TfIF-4Cl is blended with the polymer donor PM7 to fabricate the PSC, the device maintains high V OC (0.97 V, corresponding to a low energy loss of 0.60 eV) and presents enhanced J SC and high fill factor (78%), thus leading to an improved efficiency of 14% when compared with a PM7:TfIF-4F-based device. The high V OC but moderate photocurrent of PM7:TfIF-4Cl-based small-area device are beneficial to achieve large-area devices with high scalability according to the Joule’s law; thus, we manufacture 1.01 cm2 devices and achieve a remarkable PCE of 13.3%, which retain 95% in efficiency when the device area is scaled up from 0.04 to 1.01 cm2, and represent the best scalability when the device area is scaled up to 1 cm2 in the literature.

π‐Extended Conjugated Polymer Acceptor Containing Thienylene–Vinylene–Thienylene Unit for High‐Performance Thick‐Film All‐Polymer Solar Cells with Superior Long‐Term Stability

“…Transient photocurrent (TPC) measurement was carried out to probe the charge extraction process. [ 46 ] From the TPC plot in Figure 5F, JD40:PJTVT devices showed a faster charge extraction time (CET) of 0.35 µs than JD40:PJTET devices (1.08 µs). For the JD40:PJTVT devices, the faster charge extraction may be due to a better charge transport process and weaker trap recombination losses.…”

Efficient Organic Solar Cells from Molecular Orientation Control of M-Series Acceptors

“…Therefore, using IDTT-like fused-ring cores with various side chains on the sp 3 -hybridized bridging carbon atoms, many ADA-type nonfullerene acceptors have been demonstrated with excellent PCEs of over 12%. [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] However, the sp 3 carbon-bonded side chains could also affect the close p-p stacking of the acceptor materials, which in turn limits their carrier transport. Therefore, researchers started to search for other molecular design strategies toward efficient nonfullerene acceptors.…”

Tandem Organic Solar Cells with 18.7% Efficiency Enabled by Suppressing the Charge Recombination in Front Sub‐Cell

“…The active layer of the front cell is composed of PM7:TfIF‐4Cl, which is a WBG active‐layer combination with an absorption range from 300 to 790 nm, corresponding to a calculated optical bandgap of 1.57 eV. [ 15 ] The active layer of the back cell is composed of PCE10:CO i 8DFIC:PC 70 BM, which is an LBG system that has a broad absorption range from 300 to 1050 nm, corresponding to a calculated optical bandgap of 1.20 eV. [ 16 ] Before construction of the TOSCs, single‐junction OSCs were constructed and tested.…”

“…PNDIT-F3N and TfIF-4Cl was synthesized according to the authors' previously reported procedures. [15,25] ZnO NPs was synthesized according to the reported method. [26] PCE10, PC 70 BM, PEI, 1,8-diiodooctane (DIO), chlorobenzene (CB), and chloroform (CF) were obtained from Sigma-Aldrich.…”