Life cycle assessment of ITO-free flexible polymer solar cells prepared by roll-to-roll coating and printing

• Published in: Solar energy materials and solar cells Vol. 97; pp. 3 - 13
• Main Authors: Espinosa, Nieves, García-Valverde, Rafael, Urbina, Antonio, Lenzmann, Frank, Manceau, Matthieu, Angmo, Dechan, Krebs, Frederik C.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.02.2012; Elsevier
• Subjects: Aluminum/chromium cathode; Applied sciences; Energy; Exact sciences and technology; Flexible substrates; ITO-free; Life cycle assessment; Natural energy; Photovoltaic conversion; Polymer solar cells; Roll-to-roll coating; Solar cells. Photoelectrochemical cells; Solar energy; Life cycle assessment; Aluminum/chromium cathode; Flexible substrates; Roll-to-roll coating; Polymer solar cells; ITO-free; Performance evaluation; Energy consumption; Energy input; Organic solar cells; Optimization; Sputtering; Life cycle; Tin addition; Electric power consumption; Illumination; ITO layers; Manufacturing; Protective coatings; Cathode; Aluminium; Indium; Indium oxide; Roll-to-roll process; High energy; Flexible structure; Environment impact; Chromium; Large scale; Comparative study
• ISSN: 0927-0248; 1879-3398
• DOI: 10.1016/j.solmat.2011.09.048

Indium is a scarce and expensive material that has been identified as a bottleneck for future organic electronics deployment in large scale. Indium is the main constituent of Indium Tin Oxide (ITO), which is the most successful transparent electrode in organic photovoltaics (OPV) so far. A new process, termed Hiflex, allows for manufacture of flexible OPV modules where the ITO electrode has been replaced by a sputtered Al/Cr electrode in an inverted device architecture with front illumination. This work presents a life cycle assessment of the Hiflex process, in order to compare the environmental impact of avoiding ITO as electrode. The new ITO-free process reduces some of the processing steps, leading to important reductions of the energy input during OPV module manufacturing in comparison to ITO-based modules. The environmental analysis reveals an Energy Pay-Back time (EPBT) of 10 years due to the high-energy consumption of Al/Cr roll-to-roll sputtering and to the relatively low efficiency of the Hiflex OPV modules (≈1%). An optimization of the active area fraction could easily reduce the EPBT to ≈5 years. A further enhancement of the efficiency to 5% would give rise to a promising EPBT of only 1 year. Our work highlights that vacuum processing steps should be avoided. [Display omitted] ► Life cycle analysis was performed for ITO-free large area (100 cm 2) roll-to-roll processed polymer solar cells. ► Vacuum processing was found to negatively impact the EPBT when compared to a similar ITO based process. ► Inert gases and scarce materials embed also a large part of the energy consumption. ► Geometrical factors lead to important looses upon upscaling, relaying on the usage of processed area.