Controlling intercalations of PBDTTT-EFT side chain to initiate suitable network for charge extraction in PBDTTT-EFT:PC71BM blended bulk heterojunction solar cell

Komilian, Soheil; Oklobia, Ochai; Sadat-Shafai, Torfeh

doi:10.1016/j.solmat.2017.10.007

Cited by 5 publications

(7 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of different polymer:fullerene blend mass ratios (1:0.5; 1:1; 1:1.5; 1:2 and 1:3) on the photovoltaic performance of PTB7-Th:PC 71 BM devices, with standard architecture, was investigated by Komilian et al [62]. No additives were used and the surface of the BHJ was washed with ethanol before top electrode deposition.…”

Section: Devices Based On Ptb7-thmentioning

confidence: 99%

“…In practice, FF depends on the I-V shape in the 4th quadrant. As the D:A junction degrades (by molecular conformation and orientation and/or energetically inappropriate levels of D:A materials) the I-V behaviour becomes more space charge limited (SCLC) dependent and the I-V curve displays a typical “s-shape.” Common strategies to reduce R s and increase R sh include using buffer layers to reduce recombination [55], increasing the crystallinity of the BHJ materials [55,61], changing the donor: acceptor mass ratios [62] and optimizing the size of phase domains in the BHJ [55,61].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Recent Developments in the Optimization of the Bulk Heterojunction Morphology of Polymer: Fullerene Solar Cells

et al. 2018

View full text Add to dashboard Cite

Organic photovoltaic (OPV) devices, made with semiconducting polymers, have recently attained a power conversion efficiency (PCE) over 14% in single junction cells and over 17% in tandem cells. These high performances, together with the suitability of the technology to inexpensive large-scale manufacture, over lightweight and flexible plastic substrates using roll-to-roll (R2R) processing, place the technology amongst the most promising for future harvesting of solar energy. Although OPVs using non-fullerene acceptors have recently outperformed their fullerene-based counterparts, the research in the development of new fullerenes and in the improvement of the bulk-heterojunction (BHJ) morphology and device efficiency of polymer:fullerene solar cells remains very active. In this review article, the most relevant research works performed over the last 3 years, that is, since the year 2016 onwards, in the field of fullerene-based polymer solar cells based on the copolymers PTB7, PTB7-Th (also known as PBDTTT-EFT) and PffBT4T-2OD, are presented and discussed. This review is primarily focused on studies that involve the improvement of the BHJ morphology, efficiency and stability of small active area devices (typically < 15 mm2), through the use of different processing strategies such as the use of different fullerene acceptors, different processing solvents and additives and different thermal treatments.

show abstract

Section: Devices Based On Ptb7-thmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recent Developments in the Optimization of the Bulk Heterojunction Morphology of Polymer: Fullerene Solar Cells

et al. 2018

View full text Add to dashboard Cite

show abstract

“…These results are consistent with our earlier studies of GIWAXS where EF(+) treatment was carried out on P3HT: PC 70 BM BHJ films. [6a] The XRD peak of polymer donor around Q value of 0.31 A −1 , corresponds to the alkyl interchain interaction (100) . The lower intensity of the PTB7‐Th peak reflects the amorphous nature of the donor polymer.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Stability and Optimized Morphology Induced by Electric‐Field‐Assisted Annealing of Bulk Heterojunction Solar Cells

2019

View full text Add to dashboard Cite

The utility of electric fields during the bulk heterojunction (BHJ) film drying process for tuning the morphology and stability of the device is demonstrated. An external electric-field-assisted annealing (EFTA) treatment is used to engineer the stability of amorphous donor polymer-based BHJs without compromising device performance. Residual additive in the device post fabrication is a major source of degradation. Thermal annealing of an active layer effectively removes residual additive, which in case of amorphous polymer donor-based BHJs, however, leads to unfavorable changes in the morphology. The detrimental effect of thermal annealing in amorphous donor polymer-based solar cells is mitigated by the presence of an electric field during the drying stage. The complete removal of additive is ensured by this treatment procedure and leads to improved packing and a rigid morphology. The structural stability is reflected in the performance parameters monitored over the long term and electrical noise measurements. The magnitude and polarity of the applied electric field are observed to control the vertical distribution of donor and acceptor components.

show abstract

“…To this end, purposely various percentage loading of PC 71 BM was introduced in the blend, to observe its impact on parameters such as power conversion efficiency, fill factor, Short circuit current density, open circuit voltage, device shunt and series resistance. The data presented here are based on additional experimental observation reported in our recent paper [1] . Electrical characterisation of these devices are shown in Fig.…”

Section: Datamentioning

confidence: 89%

Data related to the PC71BM loading and it's impact on nanostructuring for blend of PBDTTT-EFT:PC71BM bulk heterojunction solar cell

2018

Self Cite

View full text Add to dashboard Cite

The data included in this article is based on additional supporting information presented in our recent publication Komilian et al. [1]. The role of acceptor material (PC71BM) in restructuring copolymer PBDTTT-EFT from its relaxed pristine structure to interfaces suitable for exciton dissociation is discussed. The analysis of data indicates that the impact of acceptor material on nanostructuring initiates concurrent processes some of which supports and some impedes charge extractions. Therefore, this manuscript is designed to identify these processes and give and account of their impact on power conversion efficiency.

show abstract

Controlling intercalations of PBDTTT-EFT side chain to initiate suitable network for charge extraction in PBDTTT-EFT:PC71BM blended bulk heterojunction solar cell

Cited by 5 publications

References 45 publications

Recent Developments in the Optimization of the Bulk Heterojunction Morphology of Polymer: Fullerene Solar Cells

Recent Developments in the Optimization of the Bulk Heterojunction Morphology of Polymer: Fullerene Solar Cells

Enhanced Stability and Optimized Morphology Induced by Electric‐Field‐Assisted Annealing of Bulk Heterojunction Solar Cells

Data related to the PC71BM loading and it's impact on nanostructuring for blend of PBDTTT-EFT:PC71BM bulk heterojunction solar cell

Contact Info

Product

Resources

About