TY - JOUR
T1 - Printed zinc tin oxide diodes
T2 - From combustion synthesis to large-scale manufacturing
AU - Carlos, Emanuel
AU - Branquinho, Rita
AU - Jansson, Elina
AU - Leppäniemi, Jaakko
AU - Menezes, Jose
AU - Pereira, Rita
AU - Deuermeier, Jonas
AU - Alastalo, Ari
AU - Eiroma, Kim
AU - Hakola, Liisa
AU - Fortunato, Elvira
AU - Martins, Rodrigo
N1 - Funding Information:
This work is funded in part by National Funds through FCT—Fundação para a Ciência e Tecnologia, I P, under the scope of the project UIDB/50025/2020. E Carlos acknowledges the postdoctoral grant (Grant No. 951774) from the project FOXES. VTT’s and FCT’s work was funded in part by European Institute of Innovation and Technology (EIT RawMaterials, Horizon 2020) Supersmart, Scale-Up of Printed Electronics, Grant Agreement 17161. Part of the facilities used at VTT were provided by the Academy of Finland Research Infrastructure Printed Intelligence Infrastructure (PII‐FIRI, Grant No. 32020). E Fortunato acknowledges the ERC AdG Grant 787410 from the project DIGISMART. We acknowledge to the project SYNERGY H2020-WIDESPREAD-2020-5, CSA, proposal No. 952169. M Alexandre is thanked for technical assistance to make the R2R schematic. P Hakkarainen, A Pesonen, and Hannu Sääskilahti from VTT are thanked for technical assistance and operation of the roll-to-roll pilot line ROKO.
Publisher Copyright:
© 2022 IOP Publishing Ltd.
PY - 2022/1/31
Y1 - 2022/1/31
N2 - Printed metal oxide devices have been widely desired in flexible electronic applications to allow direct integration on foils and to reduce electronic waste and associated costs. Especially, semiconductor devices made from non-critical raw materials, such as Zn, Sn (and not, for example, In), have gained significant interest. Despite considerable progress in the field, the upscale requirements from lab to fab scale to produce these materials and devices remain a challenge. In this work, we report the importance of solution combustion synthesis (SCS) when compared with sol-gel in the production of zinc tin oxide (ZTO) thin films using a solvent (1-methoxypropanol) that has lower environmental impact than the widely used and toxic 2-methoxyethanol. To assure the compatibility with low-cost flexible substrates in high-throughput printing techniques, a low annealing temperature of 140 °C was achieved for these thin films by combining SCS and infrared annealing in a short processing time. These conditions allowed the transition from spin-coating (lab scale) to flexographic printing (fab scale) at a printing speed of 10 m min-1 in a roll-to-roll pilot line. The ZTO (1:1 Zn:Sn-ratio) diodes show a rectification ratio of 103, a low operation voltage (≤ 3 V), promising reproducibility and low variability. The results provide the basis for further optimisation (device size, encapsulation) to meet the requirements of diodes in flexible electronics applications such as passive-matrix addressing, energy harvesting and rectification.
AB - Printed metal oxide devices have been widely desired in flexible electronic applications to allow direct integration on foils and to reduce electronic waste and associated costs. Especially, semiconductor devices made from non-critical raw materials, such as Zn, Sn (and not, for example, In), have gained significant interest. Despite considerable progress in the field, the upscale requirements from lab to fab scale to produce these materials and devices remain a challenge. In this work, we report the importance of solution combustion synthesis (SCS) when compared with sol-gel in the production of zinc tin oxide (ZTO) thin films using a solvent (1-methoxypropanol) that has lower environmental impact than the widely used and toxic 2-methoxyethanol. To assure the compatibility with low-cost flexible substrates in high-throughput printing techniques, a low annealing temperature of 140 °C was achieved for these thin films by combining SCS and infrared annealing in a short processing time. These conditions allowed the transition from spin-coating (lab scale) to flexographic printing (fab scale) at a printing speed of 10 m min-1 in a roll-to-roll pilot line. The ZTO (1:1 Zn:Sn-ratio) diodes show a rectification ratio of 103, a low operation voltage (≤ 3 V), promising reproducibility and low variability. The results provide the basis for further optimisation (device size, encapsulation) to meet the requirements of diodes in flexible electronics applications such as passive-matrix addressing, energy harvesting and rectification.
KW - low temperature
KW - metal oxides
KW - printed Schottky diodes
KW - roll-to-roll (R2R)
KW - solution combustion synthesis
UR - http://www.scopus.com/inward/record.url?scp=85125447697&partnerID=8YFLogxK
U2 - 10.1088/2058-8585/ac4bb1
DO - 10.1088/2058-8585/ac4bb1
M3 - Article
AN - SCOPUS:85125447697
VL - 7
JO - Flexible and Printed Electronics
JF - Flexible and Printed Electronics
SN - 2058-8585
IS - 1
M1 - 014005
ER -