Perovskite Solar Cells with Versatile Electropolymerized Fullerene as Electron Extraction Layer

LORENA MACOR; EDGARDO N. DURANTINI; MIGUEL GERVALDO; LORENA MACOR; M. BELÉN SUAREZ; EDGARDO N. DURANTINI; JAVIER DURANTINI; MIGUEL GERVALDO; LUIS OTERO; M. BELÉN SUAREZ; JAVIER DURANTINI; LUIS OTERO; CLARA ARANDA; DANIEL HEREDIA; ANTONIO GUERRERO; CLARA ARANDA; DANIEL HEREDIA; ANTONIO GUERRERO

ELECTROCHIMICA ACTA

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2018 p. 697 - 706

0013-4686

Fullerenes act as efficient electron extraction materials in CH3NH3PbX3 perovskite solar cells, but their layers are normally deposited by methods that are non-scalable and/or expensive, such as spin coating and vacuum evaporation. Alternatively, electrochemical techniques are inexpensive, scalable and very powerful for formation of robust organic layers with a precise thickness control. The use of an electropolymerized layer of a C60 fullerene derivative as selective contact and electron transport layer in perovskite solar cells is reported. The electropolymeric film is formed over FTO electrodes by an electrochemical method in just one step. Solar cells constructed with C60 polymer layer show a much better performance compared with the same cell without a fullerene containing electropolymer layer. The best non-optimized device presents a promising high efficiency of 11.0%, with an open circuit voltage of 969 mV, a short circuit current of 17 mA/cm2, and a fill factor of 0.65.The use of an electrochemical methodology in the formation of organic electron transport layers as replacement of metal oxides in perovskite solar cells opens a new approach in the fabrication of efficient energy conversion systems.