Improved Performance of Organic Solar Cells by Utilizing Green Non‐Halogen Additive to Modulate Active‐Layer Morphology

Abstract

Using solvent additives to optimize the morphology of the blend films in organic solar cells (OSCs) is a simple and effective method. Here, methyl salicylate (MeSA) is used as a non‐halogen additive for inverted OSCs, and the impact of this additive on the blend film and photovoltaic performance is carefully investigated. The significant increase in short‐circuit current density (JSC) and fill factor (FF) leads to a significant improvement in device performance, which is caused by bicontinuous interpenetrating phase separation and balanced charge transport. The results indicate that MeSA modulates the phase distribution and promotes the accumulation of ordered molecules in the blend film, thus exhibiting an efficiency of 9.45% and improved FF (>70%) with a 7% MeSA additive. Most importantly, MeSA can be added in large doses (7%) compared to other traditional solvent additives (e.g., 1,8‐diiodooctane, 1‐chloronaphthalene, etc.), indicating that its concentration variation has little effect on performance and is conducive to repeatable, large‐scale production, which is of great importance for industrialization.

Efficient D1:D2:A Ternary Polymer Solar Cells with Low Voltage Loss and Unblocked Hole Transport Channel Characterized by Kelvin Probe Force Microscopy

“…Comparatively, the PBB-F-based film upon adding 20% PM6 exhibits an enhancement of the (100) peak signal located at 0.30 Å –1 in the IP direction and the (010) peak signal located at 1.51 Å –1 in the OOP direction, which indicates that the π–π stacking structure is enhanced after incorporating PM6 into the PBB-F-based binary blend film. All of the results show that incorporating PM6 into the binary blend film as the third component promotes more ordered molecules to aggregate, which is in agreement with the improved charge transport and extraction. , …”

Highly Sensitive Broad Light Response Organic Photodetectors from Pyrrolo[3,4-c]pyrrole-1,4-dione-Based Conjugated Polymer with Noncovalent Conformational Locks

“…Photodetectors, as light-to-electricity conversion units have been applied in various fields, such as environmental monitoring, optical communication, biological detection, and image sensing. , Photodetectors based on inorganic semiconductor silicon (Si) and its compounds, generally exhibiting a high-gain bandwidth product, high response speed, and high stability, have dominated the commercial photodetection market. Since being first presented by Yu et al in 1998, the organic photodiode detectors (OPDs) have attracted great attention because of their numerous desirable properties and technological advantages, that is, low cost, solution processable, mechanical flexibility, and adjustable absorption range from ultraviolet (UV) to near-infrared (NIR). − Tremendous advances such as the employment of the electron and hole blocking layers, − modification of the morphology and thickness of the photoactive layers, − manipulation of injection barrier height of the devices, , and the rational designation of the photoactive layer materials, − have been implemented during the past 20 years. For instance, in 2009, Gong and Xia et al presented an OPD from 4,6-bis­(4-decylthien-2-yl)­thieno­[3,4- c ]­thiadiazole-containing conjugated polymer (PDDTT) and [6,6]­phenyl-C61-butyric acid methyl ester (PC 61 BM) blends that achieved a broad light response range of 300–1450 nm with high specific detectivity ( D* ) over 10 12 Jones, and a large linear dynamic range (LDR) of 100 dB .…”

“…4−6 Tremendous advances such as the employment of the electron and hole blocking layers, 7−11 modification of the morphology and thickness of the photoactive layers, 12−16 manipulation of injection barrier height of the devices, 17,18 and the rational designation of the photoactive layer materials, 19−29 have been implemented during the past 20 years. For instance, in 2009, Gong and Xia et al presented an OPD from 4,6-bis(4decylthien-2-yl)thieno [3,4-c]thiadiazole-containing conjugated polymer (PDDTT) and [6,6]phenyl-C61-butyric acid methyl ester (PC 61 BM) blends that achieved a broad light response range of 300−1450 nm with high specific detectivity (D*) over 10 12 Jones, and a large linear dynamic range (LDR) of 100 dB. 20 Qiao et al presented a series of OPDs based on thienothiadiazole-based low-bandgap terpolymers, which achieved wide light response from 400 to 1200 nm and the highest D* above 10 12 Jones from 330 to 950 nm via subtle modification of the side chain content on the thiophene πbridge.…”

“…For instance, in 2009, Gong and Xia et al presented an OPD from 4,6-bis(4decylthien-2-yl)thieno [3,4-c]thiadiazole-containing conjugated polymer (PDDTT) and [6,6]phenyl-C61-butyric acid methyl ester (PC 61 BM) blends that achieved a broad light response range of 300−1450 nm with high specific detectivity (D*) over 10 12 Jones, and a large linear dynamic range (LDR) of 100 dB. 20 Qiao et al presented a series of OPDs based on thienothiadiazole-based low-bandgap terpolymers, which achieved wide light response from 400 to 1200 nm and the highest D* above 10 12 Jones from 330 to 950 nm via subtle modification of the side chain content on the thiophene πbridge. 21 the OPDs possessed a broad spectral response from 350 to 1100 nm with a peak D* of 1.02 × 10 13 Jones at 800 nm.…”

“…In addition, the OPDs based on DPP-containing polymers present comparable sensitivity to those based on inorganic semiconductors as demonstrated in many research reports. 35−37 36 However, compared with the silicon-based photodiodes which exhibited a high D* greater than 10 12 Jones from 300 to 1100 nm, 20 the reported OPDs based on the DPP-containing polymers that cover a similar wide light response range are still scarce.…”