On the spatial inhomogeneity of charge generation and collection in inverted all polymer solar cells

Perulli, Andrea; Lattante, S.; Persano, Anna; Cola, A.; Giulio, Massimo Di; Anni, M.

doi:10.1063/1.4817506

Cited by 5 publications

(2 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The NPs, after grinding, were stable in solution without any precipitation, obtaining very uniform and thin films upon spin coating and final device PCEs over 3.5%. Our group realized all polymer ISC using a thin layer (about 80 nm) of ZnO on fluorine-doped tin oxide (FTO) by simply spin coating a commercial (Sigma Aldrich, St. Louis, MO, USA) aqueous dispersion of ZnO NPs with an average diameter less than 100 nm [50], without any post deposition annealing process. The layer morphology resulted in a very uniform sphere-like texture (see Figure 4) without any cracking or pinholes, with an average surface roughness of 4.53 nm.…”

Section: Znomentioning

confidence: 99%

Electron and Hole Transport Layers: Their Use in Inverted Bulk Heterojunction Polymer Solar Cells

2014

View full text Add to dashboard Cite

Bulk heterojunction polymer solar cells (BHJ PSCs) are very promising organic-based devices for low-cost solar energy conversion, compatible with roll-to-roll or general printing methods for mass production. Nevertheless, to date, many issues should still be addressed, one of these being the poor stability in ambient conditions. One elegant way to overcome such an issue is the so-called "inverted" BHJ PSC, a device geometry in which the charge collection is reverted in comparison with the standard geometry device, i.e., the electrons are collected by the bottom electrode and the holes by the top electrode (in contact with air). This reverted geometry allows one to use a high work function top metal electrode, like silver or gold (thus avoiding its fast oxidation and degradation), and eliminates the need of a polymeric hole transport layer, typically of an acidic nature, on top of the transparent metal oxide bottom electrode. Moreover, this geometry is fully compatible with standard roll-to-roll manufacturing in air and is less demanding for a good post-production encapsulation process. To date, the external power conversion efficiencies of the inverted devices are generally comparable to their standard analogues, once both the electron transport layer and the hole transport layer are fully optimized for the particular device. Here, the most recent results on this particular optimization process will be reviewed, and a general outlook regarding the inverted BHJ PSC will be depicted.

show abstract

Section: Znomentioning

confidence: 99%

Electron and Hole Transport Layers: Their Use in Inverted Bulk Heterojunction Polymer Solar Cells

2014

View full text Add to dashboard Cite

show abstract

“…In this frame, we recently demonstrated, by confocal photoluminescence (PL) and external quantum efficiency (EQE) mapping, that in polymer:polymer solar cells the local properties of the active material at the nanoscale can show inhomogeneities across the active layer on a much larger scale (up to 100 μm), strongly affecting the charge generation and collection efficiency . This result evidences that the correlation between the macroscopic device response and the local properties of the active material cannot be based only on the investigation of submicrometric sample region, without a control of the film uniformity at larger scale.…”

Section: Introductionmentioning

confidence: 98%

Study of spatial inhomogeneity in inverted all-polymer solar cells: Effect of solvent and annealing

Perulli

Lattante

Persano

et al. 2015

J. Polym. Sci. Part B: Polym. Phys.

View full text Add to dashboard Cite

The efficiency optimization of bulk heterojunction solar cells requires the control of the local active materials arrangement in order to obtain the best compromise between efficient charge generation and charge collection. Here, we investigate the large scale (10-100 lm) inhomogeneity of the photoluminescence (PL) and the external quantum efficiency (EQE) in inverted all-polymer solar cells (APSC) with regioregular poly(3-hexylthiophene) (P3HT):poly(9,9-dioctylfluorene-cobenzothiadiazole) (F8BT) active blends. The morphology and the local active polymer mixing are changed by depositing the active layer from four different solvents and by thermal annealing. The simultaneous PL and EQE mapping allowed us to inspect the effects of local irregularities of active layer thickness, polymer mixing, polymer aggregation on the charge generation and collection efficiencies. In particular, we show that the increase of the solvent boiling point affects the EQE nonuniformity due to thickness fluctuations, the density non-uniformity of rrP3HT aggregate phase, and the blend components clustering. The thermal annealing leads to a general improvement of EQE and to an F8BT clustering in all the samples with locally decrease of the EQE. We estimate that the film uniformity optimization can lead to a total EQE improvement between 2.7 and 6.3 times. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 00, 000-000

show abstract

On the homogeneity of the external quantum efficiency in a free OPV roll-to-roll flexible solar module

et al. 2019

View full text Add to dashboard Cite

On the spatial inhomogeneity of charge generation and collection in inverted all polymer solar cells

Cited by 5 publications

References 25 publications

Electron and Hole Transport Layers: Their Use in Inverted Bulk Heterojunction Polymer Solar Cells

Electron and Hole Transport Layers: Their Use in Inverted Bulk Heterojunction Polymer Solar Cells

Study of spatial inhomogeneity in inverted all-polymer solar cells: Effect of solvent and annealing

On the homogeneity of the external quantum efficiency in a free OPV roll-to-roll flexible solar module

Contact Info

Product

Resources

About