Utilizing 3,4-ethylenedioxythiophene (EDOT)-bridged non-fullerene acceptors for efficient organic solar cells

Jeon, Sung Jae; Kim, Young Hoon; Kim, Ie Na; Yang, Nam Gyu; Yun, Ji Hee; Moon, Doo Kyung

doi:10.1016/j.jechem.2021.05.032

Cited by 22 publications

(12 citation statements)

References 55 publications

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“…[ 26 ] The E LOSS can be calculated according to the equation: E LOSS = E OPT – eV OC , the E OPT is the smaller optical band gap of donor and acceptor. [ 27,28 ] The FF values are slightly decreased and still maintain over 77.0% with the weight ratio of D18:N3 decreasing from 1.1:1.6 to 0.6:1.6, indicating the good charge transport property can be well maintained in the D18:N3 active layers. The slight influence of D18:N3 weight ratio on charge transport property should be attributed to the conjugated D18 having long backbones to weave a continuous network skeleton for efficient hole transport.…”

Section: Resultsmentioning

confidence: 99%

Wide Bandgap Polymer with Narrow Photon Harvesting in Visible Light Range Enables Efficient Semitransparent Organic Photovoltaics

Jin

Xiao

et al. 2021

Adv Funct Materials

147

111

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Wide bandgap polymer D18 with narrow photon harvesting in visible light range and small molecule N3 with near‐infrared photon harvesting are adopted for building semitransparent organic photovoltaics (OPVs). To find out the optimal D18:N3 weight ratio for semitransparent OPVs, series of opaque OPVs are built with a varied D18:N3 weight ratio. The power conversion efficiency (PCE) and fill factor can be maintained over 16% and 77% in the D18:N3 (0.7:1.6, wt/wt) based opaque OPVs, respectively. The average visible transmittance (AVT) of the corresponding blend films can be achieved over 50%, demonstrating the great potential in fabricating efficient semitransparent OPVs. The semitransparent OPVs based on D18:N3 (0.7:1.6, wt/wt) are fabricated by using 1 nm Au/(10, 15, 20 nm) Ag as cathode. The thickness of Ag layers is varied to balance the optical properties and electrical properties of semitransparent top electrode. The semitransparent OPVs with 10 nm Ag achieve the highest light utilization efficiency of 2.90% with a PCE of 12.91% and an AVT of 22.49%, which should be among the best performance of reported semitransparent OPVs. This work demonstrates that the wide bandgap polymer donor with narrow photon harvesting in visible light range has great potential in preparing efficient semitransparent OPVs.

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Section: Resultsmentioning

confidence: 99%

Wide Bandgap Polymer with Narrow Photon Harvesting in Visible Light Range Enables Efficient Semitransparent Organic Photovoltaics

Jin

Xiao

et al. 2021

Adv Funct Materials

147

111

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“…With the emergence of non-fullerene acceptors (NFA), the PCE of single-junction OSCs has surpassed 18%, − and PCE of the tandem OSCs is approaching 20%. − With the rapidly developing PCE accompanied by its unique merits in solution processing, low cost, flexibility and lightweight, the OSC has attracted increasing attention for its use as a renewable energy technology for commercial applications. − Typically, a state-of-the-art OSC device contains a bulk-heterojunction (BHJ) photoactive layer with p-type polymer donors and n-type semiconductor acceptors. The NFA acceptors can be divided into acceptor–donor–acceptor (A-D-A) − and acceptor–donor–acceptor–donor–acceptor (A-DAD-A) − types. From fullerene to A-D-A and to A-DAD-A acceptors, it has been shown that the molecular design plays an important role in improving efficiency.…”

Section: Introductionmentioning

confidence: 99%

Aggregation of Small Molecule and Polymer Acceptors with 2D-Fused Backbones in Organic Solar Cells

et al. 2022

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Substitution of two-dimensional (2D) extended conjugation is considered to be an effective strategy to modify the optoelectronic properties of molecules, but the effects of these fused 2D-expansion are not clearly understood. Here, phenanthrene and acenaphthene were applied in A-DAD-A systems to study the impacts of different fused 2D-expansions. It was found that the aggregation behaviors in small molecules are quite different from those of polymer acceptors. The reasons can be explained by theoretical calculations with various configurations of monomers and dimers. This phenomenon leads to obvious diversities in morphologies in blend films, resulting in discrepancies with the performance of mobilities, exciton splitting, and bimolecular recombination in devices with the final organic solar cells (OSCs). The phenanthrene- and acenaphthene-based OSC devices, PTIC-HD-4Cl and PATIC-HD-Th, with appropriate aggregation states achieve superior power conversion efficiencies (PCEs) of 13.71% and 12.47%, while inferior PCEs of 7.29% and 6.57% are observed in OSC devices based on the ATIC-HD-4Cl and PPTIC-HD-Th with excessive aggregations. Our studies demonstrate that the packing arrangements of small molecules are quite different from that of polymer acceptors, and the fused 2D-expansion was found to be an effective strategy with which to adjust the aggregation behaviors for the design of high-crystallinity materials.

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“…This efficiency trend may result from the optimal HOMO offset difference between the donor and acceptor units, and the minimized energy loss ( E loss ), which increases the probability of charge carrier separation. , Generally, the E loss of OSCs is determined by both the competition between charge transport/extraction and recombination as well as the driving force of exciton dissociation. , Therefore, E loss is a critical parameter in the evaluation of photovoltaic performance. This parameter can be estimated through E loss = E g opt – e V oc , where E g opt is the lowest optical band gap among the donor and acceptor, and e is the elementary charge.…”

Section: Resultsmentioning

confidence: 99%

“…To investigate the contribution to device performance between the donor and acceptor in active layers, photoluminescence (PL) measurements were conducted on each film of the pristine donor and acceptor and optimized terpolymer blends. ,,,, All pristine and blended films exhibited a pronounced PL emission peak in the ranges 600–900 and 850–1400 nm when excited at 550 and 820 nm, respectively. The PL spectra are presented in Figure S28.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, the PL emissions of PM7(ClCl = 0.2):PC 71 BM:BTP-eC9 and PM7(ClCl = 0.2):P(SBDT-ClCl):BTP-eC9 ternary blend films exhibited obvious evidence of energy transfer according to the cascade energy-level alignment between the main components and each third component. Thus, a small amount of P(SBDT-ClCl) incorporated on the PM7(ClCl = 0.2):BTP-eC9 blend resulted in a remarkable difference in PLQ values compared with that of PM7(ClCl = 0.2):PC 71 BM:BTP-eC9 . Thus, P(SBDT-ClCl) was conducted as the role of minimized energy offsets and highly efficient exciton dissociation in the ternary blend structure .…”

Section: Resultsmentioning

confidence: 99%

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Bihalogenated Thiophene-Based Terpolymers for High-Performance Semitransparent Organic Solar Cells Processed by an Eco-Friendly Solvent and Layer-by-Layer Deposition

Jeon

Yang

Kim

et al. 2022

ACS Appl. Mater. Interfaces

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The development of photoactive materials simultaneously satisfying high performance, low cost, and eco-friendly processability remains challenging in organic solar cells (OSCs). Herein, a synergistic strategy is proposed to design three terpolymers (PM7(ClCl = 0.2), PM7(ClBr = 0.2), and PM7(BrBr = 0.2)) based on bihalogenated thiophenes with relatively low cost, for improving the optical and electrochemical properties, solubility in nontoxic solvents, and crystallinity and miscibility balance. In summary, a bulk-heterojunction (BHJ)-processed device based on PM7(ClCl = 0.2) with 20% dichlorinated thiophene achieves the highest power conversion efficiency (PCE) of 15.2% using toluene (best PCE ≈ 15.8% on the ternary blend). Moreover, high-performance semitransparent OSCs (ST-OSCs) were fabricated by a combination of layer-by-layer (LBL) and sequential dynamic and static spin-coating techniques according to the molecular weight of PM7(ClCl = 0.2). Using this unique LBL strategy, the PM7(ClCl = 0.2)-MW (H; high molecular weight)-processed ST-OSCs yield a high PCE of 11.5% and an average visible transmittance (AVT) of 27.1% with outstanding tolerance to device reproducibility. By optimizing ST-OSCs with tungsten trioxide as a distributed Bragg reflector, a light utilization efficiency (LUE) of 3.61% is realized with a PCE of 10.8% and an AVT of 33.4% (certified PCE ≈ 11.157%; LUE ≈ 3.73%). This study provides a novel perspective for designing and developing actual photoactive materials for OSC commercialization.

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Utilizing 3,4-ethylenedioxythiophene (EDOT)-bridged non-fullerene acceptors for efficient organic solar cells

Cited by 22 publications

References 55 publications

Wide Bandgap Polymer with Narrow Photon Harvesting in Visible Light Range Enables Efficient Semitransparent Organic Photovoltaics

Wide Bandgap Polymer with Narrow Photon Harvesting in Visible Light Range Enables Efficient Semitransparent Organic Photovoltaics

Aggregation of Small Molecule and Polymer Acceptors with 2D-Fused Backbones in Organic Solar Cells

Bihalogenated Thiophene-Based Terpolymers for High-Performance Semitransparent Organic Solar Cells Processed by an Eco-Friendly Solvent and Layer-by-Layer Deposition

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