Binary additives synergistically boost the efficiency of all-polymer solar cells up to 3.45%

Thieno[3,4‐c]Pyrrole‐4,6‐Dione‐Based Polymer Acceptors for High Open‐Circuit Voltage All‐Polymer Solar Cells

“…5.03 eV for PBDT-TS1; see Figure S15 and [15][16] and for PDI/NDI-based polymer acceptors. [18][19][20][21][22][23][24][25][26][27][28][29] From Figure 4b and Table 1 Table 1); these values, which do not take account of interfacial effects, are significantly larger than the 0.1 eV value arguably sufficient to promote efficient electron [hole] transfer at the donor-acceptor interface (a process that factually involves S1 and CT states). [63][64][65][66][67] Optical gaps estimated from the onset of the UV−vis absorption spectra (films).…”

“…However, to date, polymer acceptor developments remain synthetically challenging, and the manifold of electron-deficient motifs and polymer acceptor candidates that can rival fullerenes for efficient BHJ solar cells with polymer donors remains modest. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] Further examinations of the "all-polymer" BHJ concept require that the class of polymer acceptors that can potentially outperform fullerenes be widened and, at this stage, forging a better understanding of the design parameters that directly impact polymer acceptor performance in BHJ solar cells is a key step towards high-performing material systems and BHJ devices.…”

“…[15][16][17] In principle, polymer acceptors should have an absorption spectrum complementary to that of the donor counterpart, and the appropriate electron transport pattern to avoid space-charge build-ups induced in BHJ active layers with a significant carrier mobility imbalance. [5][6][7][8][9][10] At present, most efficient polymer acceptors involve perylenediimide (PDI) [18][19][20][21][22] or naphthalenediimide (NDI) electron-deficient motifs, [9,[23][24][25][26][27][28][29] and several studies have shown that analogues designed with PDI/NDI motifs can achieve PCEs of 5-8% in BHJ solar cells with selected polymer donors. [9][10][18][19][20][21][22][23][24][25][26][27][28][29] B←N bridged bipyridine (BNBP)-based polymer acceptors represent another emerging class of promising fullerene alternatives that has recently been shown to reach PCEs of ca.…”

High performance all-small-molecule solar cells: engineering the nanomorphology via processing additives

“…18 In addition, recent investigations also demonstrated that non-volatile additives allow ne-tuning bulk microstructures to facilitate enhanced charge transport properties. [31][32][33] Thus, it is expected that the relevant thin lm processing strategies are also helpful for the development of all-SM systems.…”

The effect of processing additives for charge generation, recombination, and extraction in bulk heterojunction layers of all-polymer photovoltaics

“…By mixing a few volume percent of processing additives with the host solvent, dichlorobenzene (DCB) or chlorobenzene, the efficiencies of many polymers can be improved dramatically. 11,12 According to these works, it can be concluded that crystallinity as well as domain size in the blends can be tuned effectively by using solvent additive mixtures. Thus, processing additives play an important role in high performance solar cells.…”