From nanomaterials to devices: Chemistry as a tool

CIC nanoGUNE Seminars

Beatriz Martín-García, Nanodevices Group
nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
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From nanomaterials to devices: Chemistry as a tool In an effort to limit the current spread of COVID-19, all seminars are **canceled** beginning Thursday March 12th until further notice **From nanomaterials to devices: Chemistry as a tool** Beatriz Martín-García, Nanodevices Group Over the past years, nanomaterials such as quantum dots (QDs), 2D transition metal dichalcogenides (TMDCs) or most recently single crystal/nanocrystal perovskites (PKSs) have found application in different kind of devices looking for exploiting their exciting optical, thermal, magnetic and electronic properties. However, many challenges are present on the road toward the final application.[1-3] Here we will focus the attention on two cases in which Chemistry has been a fundamental tool to modulate or adapt the nature of the material for optoelectronic applications, concretely, solar cells and photodetectors. PbS QD and perovskite-based solar cells have been proposed for the development of low-cost and solution-based strategies, together with the possibility of the fabrication of tandem cells with the established silicon solar cell technology. Record power conversion efficiencies of 16.6% and 25.2% have been achieved for QD and PSKs solar cells in the lab. [4] However, improvement in the ambient stability is still required. Among the possible solutions, we have successful implemented the incorporation of 2D materials designed according with the device architecture and compatible with the fabrication procedures.[5-7] Finally, we will discuss on revealing the structure-related properties for single crystal MAPbBr3 perovskites. The fine chemical control of the crystallization and growth processes allows to reduce both structural defects and non-radiative pathways towards enhanced optoelectronic properties in terms of photoluminescence and photodetection.[8] **References:** ** ** [1] Kovalenko, M. V. et al., ACS Nano **2015** , 9, 1012. [2] Manzelli, S. et al. Nat. Rev. Mater. **2017** , 2, 17033. [3] Gracini, G.; Nazeeruddin, M.K. Nat. Rev. Mater. **2019** , 4, 4. [4] NREL chart ([ efficiency.html]( [5] Martín-García, B. et al. Sol. Energy Mater. Sol. Cells **2018** , 183, 1. [6] Najafi, L., Taheri, B., Martín-García, B. et al. ACS Nano. **2018** , 12, 10736. [7] Agresti, A., Pescetelli, S., Palma, A.L., Martín-García, B. et al. ACS Energy Lett. **2019** , 4, 1862. [8] Boopathi, K.M.; Martín-García, B. et al. ACS Energy Lett. **2020** , 5, 642.