Simultaneous enhancement of short-circuit current density, open circuit voltage and fill factor in ternary organic solar cells based on PTB7-Th:IT-M:PC71BM

Sun, Yansheng; Li, Guang; Wang, Lixin; Huai, Zhaoxiang; Fan, Rui Qing; Huang, Shahua; Fu, Guangsheng; Yang, Shaopeng

doi:10.1016/j.solmat.2018.03.014

Cited by 24 publications

(15 citation statements)

References 38 publications

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“…In order to figure out the reason for recombination enhancement, the dark J-V characteristics of hole-only and electron-only devices were measured with the structure of ITO/PEDOT: PSS/active layer/Au and ITO/active layer/PDINO/Ag shown in Figure 7 . The apparent charge carrier mobility of blend films is evaluated through the spare charge limit current (SCLC) method [ 30 , 31 ]. According to the Mott–Gurney law, the current density is given by (Equation (1)):

where J is the current density, ε 0 is the permittivity of free space, ε r is the relative dielectric constant of the BHJ layer, μ is the charge carrier mobility, L is the thickness of the BHJ layer and V is the voltage drop across the device [ 32 ].…”

Section: Resultsmentioning

confidence: 99%

Synergetic Effect of Different Carrier Dynamics in Pm6:Y6:ITIC-M Ternary Cascade Energy Level System

Song

et al. 2021

Polymers

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Although reported ternary polymer solar cells have higher power conversion efficiency than binary polymers, the mechanism of exciton separation and charge transport in this complex ternary system is still unclear. Herein, based on PM6:Y6:ITIC-M ternary solar cells, we combine the technique of luminescence spectroscopy, including electroluminescence (EL) and photoluminescence (PL) with photovoltaic measurements, to understand clearly the detailed roles of ITIC-M as the third component in the contribution of device performance. The results show that ITIC-M can form the alloy-like composite with Y6 but leave individual Y6 acceptor to conduct charge transfer with PM6 donor, which improves Voc but decreases Jsc because of poor charge transfer capacity of ITIC-M. Meanwhile, the energy transfer from PM6 to ITIC-M exists in the active layers; small IE suppresses exciton dissociation. Deteriorating performance of solar cells demonstrates that, except for complementary absorption spectrum and suitable energy levels in PM6:Y6:ITIC-M system, the synergetic effects of carrier dynamics among different organic materials play an important role in influencing the performance of ternary solar cells.

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Section: Resultsmentioning

confidence: 99%

Synergetic Effect of Different Carrier Dynamics in Pm6:Y6:ITIC-M Ternary Cascade Energy Level System

Song

et al. 2021

Polymers

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“…Since AA enhances the exciton dissociation and charge collection, the carrier mobility of the devices is expected to be improved . Here, the carrier mobilities of the devices based on the BHJ layer with different volume ratios of AA to CB are measured by the space charge limiting current (SCLC) model. , ITO/ZnO/PBDB-T:N2200/PDINO/Al electron-only devices and ITO/PEDOT:PSS/PBDB-T:N2200/MoO 3 /Ag hole-only devices were prepared to support the measurement. The mobility ratio of the hole to the electron (μ h /μ e ) is shown in Figure , and the values of mobilities were tabulated in Table .…”

Section: Resultsmentioning

confidence: 99%

Improved Morphology and Interfacial Contact of PBDB-T:N2200-Based All-Polymer Solar Cells by Using the Solvent Additive p-Anisaldehyde

Huang

Huai

Ren

et al. 2019

ACS Appl. Energy Mater.

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All-polymer solar cells (all-PSCs) have been intensively investigated due to their excellent thermal and mechanical stabilities. However, the efficiency of all-PSCs is still far behind that of organic solar cells (OSCs), which are based on small molecule acceptors. Improving the efficiency of all-PSCs is of great urgency. In this work, the solvent additive named p-anisaldehyde (AA) was introduced to improve the performance of all-PSCs based on PBDB-T:N2200. It is demonstrated that AA helps to form a better network interpenetrating track and more uniform phase separation. With the assistance of AA, which has both an oleophilic methoxy group and a hydrophilic aldehyde group, the interfacial contact between the donor and the acceptor (D/A) is improved, increasing the contact area at D/A and promoting efficient exciton dissociation. More importantly, AA acts as a “bridge” between the oleophilic active layer and the hydrophilic PEDOT:PSS layer, improving the interfacial compatibility between the active layer and the PEDOT:PSS layer, reducing the interfacial resistance, and facilitating the carrier transport. Finally, the all-PSCs based on PBDB-T:N2200 exhibits a superior power conversion efficiency (PCE) of 7.24% which is a record efficiency for the current all-PSCs with the same architecture. In this work, a promising and effective strategy for achieving high efficiency all-PSCs is provided.

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“…In order to understand the effect of LiF on the charge transfer in devices, we characterized the dark J−V characteristics of single charge carrier devices (ITO/ZnO/PM6:Y6/ETL/Ag or Al) and estimated the electron mobility through the space limited current (SCLC) model as shown in Figure 7. 37,38 The results show that the electron mobilities of PFN-Br (8.47 × 10 −4 cm 2 V −1 s −1 ) and LiF (6.41 × 10 −4 cm 2 V −1 s −1 )-based devices are lower than that of L-PFN-Br (9.17 × 10 −4 cm 2 V −1 s −1 ), and the electron mobilities of PDINO (7.31 × 10 −4 cm 2 V −1 s −1 ) and LiF (6.41 × 10 −4 cm 2 V −1 s −1 ) devices are also lower than that of L-PDINO (8.26 × 10 −4 cm 2 V −1 s −1 ). These results indicate that LiF insertion can significantly improve electronic transport.…”

Section: δαmentioning

confidence: 99%

High-Efficiency and Stable Organic Solar Cells with Stacked LiF and Organic Electrolytes as Cathode Interface Layers

Ren

Ning

Liu

et al. 2021

ACS Appl. Energy Mater.

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The cathode interfacial layer plays a key role in enhancing the efficiency and stability of organic solar cells. Constructing efficient two-layer interfaces is one of the important strategies to improve device performance. In this work, we deposited a thin layer of lithium fluoride (LiF) beneath the electron transport layer poly[(9,9bis(3′-((N,N-dimethyl)-N-ethylammonium)-propyl)-2,7-fluorene)-alt-2,7-(9,9dioctylfluorene)]dibromide (PFN-Br) and (N,N-dimethyl-ammonium N-oxide)propyl perylene diimide (PDINO), respectively, to prepare conventional organic solar cells featuring a double electron transport layer. The V oc and FF of the optimized devices with a double electron transport layer were improved to achieve a power conversion efficiency (PCE) of 16.4% for LiF/PFN-Br-based devices and 16.0% for LiF/PDINObased devices. The LiF-containing double electron layers reduce the work function of the active layer, makes electron injection more efficient, and promotes charge extraction and collection. As an optical spacer layer, the thin layer of LiF also changes the internal light intensity distribution, enabling the active layer to absorb more photons and generate more excitons. In addition to PCE enhancement, the LiF-containing double layers still reduce photodegradation of the active layer and improve the stability of the device.

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Simultaneous enhancement of short-circuit current density, open circuit voltage and fill factor in ternary organic solar cells based on PTB7-Th:IT-M:PC71BM

Cited by 24 publications

References 38 publications

Synergetic Effect of Different Carrier Dynamics in Pm6:Y6:ITIC-M Ternary Cascade Energy Level System

Synergetic Effect of Different Carrier Dynamics in Pm6:Y6:ITIC-M Ternary Cascade Energy Level System

Improved Morphology and Interfacial Contact of PBDB-T:N2200-Based All-Polymer Solar Cells by Using the Solvent Additive p-Anisaldehyde

High-Efficiency and Stable Organic Solar Cells with Stacked LiF and Organic Electrolytes as Cathode Interface Layers

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