CHOSERICERCAPUBBLICAZIONI

FULLY-SPRAYED FLEXIBLE POLYMER SOLAR CELLS WITH A CELLULOSE-GRAPHENE ELECTRODE

solar cells fully sprayed

Light, flexible and low-cost organic solar cells made entirely by spray and with an innovative cellulose and graphene-based electrode!
The work, in collaboration with the Smart Materials group of the ISTITUTO ITALIANO DI TECNOLOGIA has been published on the important magazine "Materials Today Energy".

ABSTRACT:
Organic photovoltaic (OPV) technology provides energy where conventional photovoltaics are difficult to implement. The rise of efficiency due to the introduction of new polymers and the definition of strategies for the scale-up push OPV devices towards large-scale manufacturing. Here, spray coating has been employed as an easy and versatile scalable technique to deposit all the layers of flexible polymer solar cells starting from PET/ITO/Ag/ITO substrates. A foldable nanocomposite based on cellulose and sprayed graphene nanoplatelets has been applied as top electrode through lamination. The overall fabrication process has been conducted in air by using commercial materials. A significant power conversion efficiency higher than 3% has been achieved and the high quality of the lamination process has been demonstrated by bending and adhesion tests. Such photovoltaic devices are the first fully-sprayed prototypes on plastic substrate and the novel structure has also been effective for devices with active area up to 0.75 cm2.

Luca La Notte, Pietro Cataldi, Luca Ceseracciu, Ilker S. Bayer, Athanassia Athanassiou, Sergio Marras, Enrica Villari, Francesca Brunetti, Andrea Reale

Materials Today Energy

January 2018

https://doi.org/10.1016/j.mtener.2017.12.010

 

 

PEROVSKITE SOLAR CELLS ON PAPER AND THE ROLE OF SUBSTRATES AND ELECTRODES ON PERFORMANCE

on paper perovskite solar cells

The first perovskite solar cell (PSC) fabricated directly on a paper substrate with a maximum power conversion efficiency of 2.7% is here reported. The paper PSCs (PPSC) were developed with a low-temperature Paper/Au/SnO2/meso-TiO2/CH3NH3PbI3/Spiro-OMeTAD/MoOx/Au/MoOx architecture utilizing a Au/SnO2 and MoOx/Au/MoOx stack as electron- and hole- extracting electrodes respectively. The transparent MoOx/Au/MoOx electrode had a favourable combination of transmittance (62.5%) and sheet resistance (9 Ω/□). By comparing performance of cells on paper with those fabricated on glass and plastic films with different electrodes, we identify avenues that can help guide future research for improved performance. All the deposition processes used are scalable and compatible with large area printing or evaporation technologies. Paper represents a lightweight, flexible, inexpensive, ubiquitous, and environmentally friendly material, paving the way for integrating perovskite technology with other electronic components as well as for the development of stand-alone PV devices on recyclable and low-cost paper substrates.

Sergio Alexis Castro Hermosa, Janardan Dagar, Andrea Marsella, Thomas M. Brown

IEEE Electron Device Letters

August 2017

DOI: 10.1109/LED.2017.2735178

 

 

A CRYSTAL ENGINEERING APPROACH FOR PEROVSKITE SOLAR CELLS AND MODULES FABRICATION OUT OF THE GLOVE BOX

 

crystal engineering approach perovskite solar cells copyIn the present work we used some crystallization trends which could be classified as Crystal Engineering (CE) methods, for deposition of a pure cubic-phase thin film of CH3NH3PbI3 at the surface of mesoporous TiO2 layer. Accordingly, by using the CE approach in air, we fabricated high efficiency perovskite solar cells (PSC) and perovskite solar modules (PSM) utilizing several Hole Transport Layers (HTLs). The results show that the CE approach remarkably improved the device performance reaching a power conversion efficiency of 17%, 16.8% and 7% for spiro-OMeTAD, P3HT and HTL free, respectively. Furthermore, perovskite solar modules (active area of 10.1 cm2), could reach an overall efficiency of 13% and 12.1% by using spiro-OMeTAD and P3HT as HTLs, respectively. Sealed modules showed promising results in terms of stability maintaining 70% of the initial efficiency after 350 hours of light soaking at maximum power point.

N. Yaghoobi Nia, M. Zendehdel, F. Matteocci, L. Cinà, A. Di Carlo

J. Mat. Chem. A
6, 659-671
DOI: 10.1039/C7TA08038G

http://pubs.rsc.org/en/content/articlelanding/2018/ta/c7ta08038g#!divAbstract

 

PHOTOELECTROCHEMICAL AND SPECTROPHOTOMETRIC STUDIES ON DYE-SENSITIZED SOLAR CELLS (DSCS) AND STABLE MODULES (DSCMS) BASED ON NATURAL APOCAROTENOIDS PIGMENTS

dsc dscm natural apocarotenoids pigments

We present a study on dye-sensitized solar cells (DSCs) and we fabricate dye-sensitized solar modules (DSCMs) based on natural apocarotenoids extracted from the achiote's seeds (annatto). Use of less polar solvent such as diethyl ether improves the bixin concentration in the annatto extract which, was employed as sensitizer in the devices. We measure IPCE max (∼33%) and estimate ϕinj≥0.438 for annatto. By accurate and progressive optimization of both TiO2 multilayer photoanode and of electrolyte composition an efficiency (η) around 1.6%, is achieved, with an improvement of about ∼742% compare to the best performance for annatto extract, so far reported. DSCM shows stability which overcomes 1000 h (shelf-life test), under 1 sun, and produces a battery capacity of ∼46.8 Ah, the equivalent to ∼15 type AAA standard battery, in a similar time period. Although annatto based DSCMs are still below the efficiency requirements for practical applications for large scale industry, our encouraging results, testify the potentiality of this pigment in the production of non-toxic, cheap, long term stable and environmentally friendly vegetable based solar devices, as alternatives to batteries for small electronic goods market.

Giuseppe Calogero, Jessica Barichello, Ilaria Citro, Paolo Mariani, Luigi Vesce, Antonino Bartolotta, Aldo Di Carlo, Gaetano Di Marco

Dyes and Pigments 155 (2018) 75-83
doi: 10.1016/j.dyepig.2018.03.021

https://doi.org/10.1016/j.dyepig.2018.03.021

 

PEROVSKITE MODULE

perovskite module

We fabricated the first perovskite-based monolithic series-type module showing very promising results in terms of the power conversion efficiency, the reproducibility of the fabrication process and long-term stability. To achieve these results, important innovative procedures were implemented in order to realize an efficient up-scaling process including:

  • a customised formulation of TiO2 paste to realize a uniform thin titania scaffold by Screen Printing technique
  • a proper cleaning procedure of the CH3NH3PbI3-xClx on the interconnection area between single cells to realize a patterned perovskite deposition
  • a c-TiO2 patterned deposition

Furthermore, two different HTMs were used, i.e. the Spiro-OMeTAD and the P3HT polymer both reaching a PCE equal to 5.1%. The P3HT was utilized as cost-effective alternative material also to test the reproducibility of the fabrication process. These fabrication processes were here used for the first time to define a reproducible fabrication procedure applicable to large area. To achieve better performance in terms of PCE and long-term stability, future developments will concentrate on the study of efficient sealants, the optimisation of the perovskite deposition and the cleaning procedure of the interconnection area between neighbouring cells.


F. Matteocci, S. Razza, F. Di Giacomo, S. Casaluci, G. Mincuzzi, T. M. Brown, A. D'Epifanio, S. Licoccia and A. Di Carlo
"Solid-state solar modules based on mesoscopic organometal halide perovskite: a route towards the up-scaling process"

DOI: 10.1039/C3CP55313B

 

 

PEROVSKITE SOLAR CELLS AT CHOSE: A NEW PHOTOVOLTAIC TECHNOLOGY

potential

We fabricated perovskite based solar cells using CH3NH3PbI3-xClx with different hole transporting materials such as Spiro-OMeTAD and P3HT. By tuning the energy level of P3HT and optimizing the device’s fabrication, we reached 9.3% of power conversion efficiency showing that P3HT can be a suitable low cost hole transport material for efficient perovskite based solar cells.

[ Di Giacomo et al, J. Power Sources 251, 152 (2014)]

 

 

THE PHOTOVOLTAIC GREENHOUSE

THE PHOTOVOLTAIC GREENHOUSE           THE PHOTOVOLTAIC GREENHOUSE           THE PHOTOVOLTAIC GREENHOUSE

We have demonstrated the feasibility of the fabrication of a photovoltaic greenhouse roof by using techniques based on solution processing (spray coating and screen printing). The panel ensures the suitable transmittance for plants and is composed of modules connected in series and parallel.

The work was funded by ECOFLECS Project (partners: Aero Sekur SpA, Uni Roma Tor Vergata, UniTuscia, CNR-IBAF).

 

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