Revealing the effect of donor/acceptor intermolecular arrangement on organic solar cells performance based on two-dimensional conjugated small molecule as electron donor

Sun, Qianqian; Zhang, Fujun; An, Qiaoshi; Li, Lingliang; Wang, Jian; Zhang, Miao; Wang, Wenbin; Feng, Tao; Zhang, Jian

doi:10.1016/j.orgel.2015.05.010

Cited by 16 publications

(8 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4,5 Several efficient strategies have been employed to modify and control the phase separation of the active layer, such as thermal annealing, hot solution, solvent vapor annealing, mixing solvent, and solvent additives. [6][7][8][9][10] Interfacial engineering also plays a critical role in improving the performance of PSCs by incorporating an interfacial layer between the active layers and electrodes. The conjugated polyelectrolytes (CPEs) are considered as promising candidates for cathode interfacial materials to form an interfacial dipole for obtaining highly efficient PSCs.…”

Section: Introductionmentioning

confidence: 99%

A two-step strategy to clarify the roles of a solution processed PFN interfacial layer in highly efficient polymer solar cells

et al. 2015

Self Cite

View full text Add to dashboard Cite

† Electronic Supplementary Information (ESI) available: [detailed J-V characteristic curves; the key parameters of PSCs dependence on the soaking time; the work functions of active layers]. SeeSolution processed PFN interfacial layer has been demonstrated as an efficient method to improve the performance of polymer solar cells (PSCs). The champion power conversion efficiency (PCE) of PSCs with PBT7-Th:PC 71 BM as the active layer was increased from 6.13% to 7.72% by directly spin-coating PFN methanol solution on the surface of active layers or to 8.50% for the active layer with 4 min PFN methanol solution soaking. The champion PCE of PSCs was further increased to 8.69% for the active layers with a twosteps treatment, 4 min methanol soaking and then directly spin-coating PFN methanol solution. A 12.6% PCE improvement was obtained by using the two-steps strategy compared with directly spin-coating PFN methanol solution on the active layers. The methanol soaking the active layers plays the key role in forming the more ideal vertical phase separation for efficient exciton dissociation, charge carrier transport and collection. An ultrathin PFN interfacial dipole layer can be obtained by directly spin-coating PFN methanol solution. The two-steps strategy may provide a simple and effective method to finely optimize the phase separation and obtain an ultrathin PFN interfacial dipole layer for the performance improvement of PSCs.

show abstract

Section: Introductionmentioning

confidence: 99%

A two-step strategy to clarify the roles of a solution processed PFN interfacial layer in highly efficient polymer solar cells

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…As shown in the inset of Figure S3a, the PL intensity of PTB7:PC71BM is weaker than that of PTB7:ICBA, which indicates the relatively stronger PTB7 exciton dissociation in PTB7:PC71BM film, which is in agreement with the enhancement of J sc in PTB7:PC71BM (Table S1). 44 The PL spectra of PTB7:ICBA samples obtained with binary and ternary solvents do not present any major differences. To better understand the improvement of PTB7:ICBA sample obtained with ternary solvent over that of the binary, we performed transient photocurrent measurement to study the difference in charge transit time.…”

Section: Resultsmentioning

confidence: 91%

Probing Ternary Solvent Effect in High V_oc Polymer Solar Cells Using Advanced AFM Techniques

Ding

Soliman

et al. 2016

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

This work describes a simple method to develop a high V(oc) low band gap PSCs. In addition, two new atomic force microscopy (AFM)-based nanoscale characterization techniques to study the surface morphology and physical properties of the structured active layer are introduced. With the help of ternary solvent processing of the active layer and C60 buffer layer, a bulk heterojunction PSC with V(oc) more than 0.9 V and conversion efficiency 7.5% is developed. In order to understand the fundamental properties of the materials ruling the performance of the PSCs tested, AFM-based nanoscale characterization techniques including Pulsed-Force-Mode AFM (PFM-AFM) and Mode-Synthesizing AFM (MSAFM) are introduced. Interestingly, MSAFM exhibits high sensitivity for direct visualization of the donor-acceptor phases in the active layer of the PSCs. Finally, conductive-AFM (cAFM) studies reveal local variations in conductivity in the donor and acceptor phases as well as a significant increase in photocurrent in the PTB7:ICBA sample obtained with the ternary solvent processing.

show abstract

“…In another case, large phase size in active layers is propitious to charge carrier transport; meanwhile, exciton dissociation may be depressed because most of excitons must undergo a longer diffusion range to reach the limited D/A interfaces. − The balanced excitons and charge carrier dynamic processes can be achieved by finely optimizing phase separation degree . Recently, several efficient strategies have been developed to tailor phase separation degree by employing mixed solvents, hot solution, thermal annealing (TA), solvent vapor annealing (SVA), and methanol treatment. − Apart from the aforementioned strategies, solvent additives have been widely adopted to adjust phase separation during the time scale of film formation, which is a particularly welcomed strategy when TA treatment cannot be implemented due to the natural properties of used materials, especially for highly efficient narrow band gap polymer materials …”

Section: Introductionmentioning

confidence: 99%

Dramatically Boosted Efficiency of Small Molecule Solar Cells by Synergistically Optimizing Molecular Aggregation and Crystallinity

Zhang

Sun

et al. 2017

ACS Sustainable Chem. Eng.

Self Cite

View full text Add to dashboard Cite

For the given organic donor and acceptor materials, optimizing molecular aggregation and crystallinity for appropriate phase separation plays a crucial role in achieving high performance solar cells. In this study, the power conversion efficiency (PCE) of DR3TSBDT:PC71BM based small molecule solar cells (SMSCs) was markedly raised from 7.25% to 9.48% for active layers processed with 0.2 vol % 1,8-diiodooctane (DIO), resulting from the improved fill factor (FF) and short circuit current density (J SC). The performance improvement may be attributed to an appropriate DR3TSBDT molecular aggregation and crystallinity, as well as the optimized phase separation. The influence of DIO concentrations on DR3TSBDT molecular aggregation can be confirmed from the red-shifted absorption and photoluminescence peaks of films along with increase of DIO concentrations. Meanwhile, the ratio of hole/electron mobility approached 1.06 in the optimized SMSCs well according with the highest FF of the corresponding SMSCs. The morphology characterizations indicate that DR3TSBDT molecular aggregation and crystallinity could be finely adjusted by doping appropriate DIO additive.

show abstract

Revealing the effect of donor/acceptor intermolecular arrangement on organic solar cells performance based on two-dimensional conjugated small molecule as electron donor

Cited by 16 publications

References 41 publications

A two-step strategy to clarify the roles of a solution processed PFN interfacial layer in highly efficient polymer solar cells

A two-step strategy to clarify the roles of a solution processed PFN interfacial layer in highly efficient polymer solar cells

Probing Ternary Solvent Effect in High V_oc Polymer Solar Cells Using Advanced AFM Techniques

Dramatically Boosted Efficiency of Small Molecule Solar Cells by Synergistically Optimizing Molecular Aggregation and Crystallinity

Contact Info

Product

Resources

About

Revealing the effect of donor/acceptor intermolecular arrangement on organic solar cells performance based on two-dimensional conjugated small molecule as electron donor

Cited by 16 publications

References 41 publications

A two-step strategy to clarify the roles of a solution processed PFN interfacial layer in highly efficient polymer solar cells

A two-step strategy to clarify the roles of a solution processed PFN interfacial layer in highly efficient polymer solar cells

Probing Ternary Solvent Effect in High Voc Polymer Solar Cells Using Advanced AFM Techniques

Dramatically Boosted Efficiency of Small Molecule Solar Cells by Synergistically Optimizing Molecular Aggregation and Crystallinity

Contact Info

Product

Resources

About

Probing Ternary Solvent Effect in High V_oc Polymer Solar Cells Using Advanced AFM Techniques