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**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 ([https://www.nrel.gov/pv/cell-
efficiency.html](https://www.nrel.gov/pv/cell-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.