Perovskite solar cells (PSCs) are evolving with an impressive pace, emerging as the most promising next-generation photovoltaic devices. Nevertheless, beside these enormous progresses, the stability of PSCs remains one of the major problems to be challenged, because the most commonly used hole transporting material (HTM), the 2,2',7,7'-Tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (Spiro-OMeTAD), suffers long-term stability. Here, we tackle this long-lasting issue exploiting reduced graphene oxide (RGO), prepared by an easy and efficient reduction method, as HTM in PSCs. We carried out endurance tests over 1987 h of shelf life and 120 h of light soaking. The PSCs based on RGO have shown power conversion efficiency (PCE) of 6.6%, outperforming the ones achieved with the Spiro-OMeTAD (PCE=6.5%), after the shelf life test. The light soaking test confirmed the better durability of RGO-based PSCs with respect to the Spiro-OMeTAD ones, the latter showing a reduction in PCE 2.7 times higher than the RGO-based cells. Moreover, we demonstrate by Open Circuit Voltage Decay measurements that RGO, beside the HTM function, acts also as an anti-recombination layer, reducing the charge carriers recombination pathways and, hence, increasing their lifetime. © 2016 Elsevier Ltd.

Palma, A.L., Cina', L., Pescetelli, S., Agresti, A., Raggio, M., Paolesse, R., et al. (2016). Reduced graphene oxide as efficient and stable hole transporting material in mesoscopic perovskite solar cells. NANO ENERGY, 22, 349-360 [10.1016/j.nanoen.2016.02.027].

Reduced graphene oxide as efficient and stable hole transporting material in mesoscopic perovskite solar cells

PALMA, ALESSANDRO LORENZO;CINA', LUCIO;PESCETELLI, SARA;AGRESTI, ANTONIO;RAGGIO, MICHELE;PAOLESSE, ROBERTO;DI CARLO, ALDO
2016

Abstract

Perovskite solar cells (PSCs) are evolving with an impressive pace, emerging as the most promising next-generation photovoltaic devices. Nevertheless, beside these enormous progresses, the stability of PSCs remains one of the major problems to be challenged, because the most commonly used hole transporting material (HTM), the 2,2',7,7'-Tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (Spiro-OMeTAD), suffers long-term stability. Here, we tackle this long-lasting issue exploiting reduced graphene oxide (RGO), prepared by an easy and efficient reduction method, as HTM in PSCs. We carried out endurance tests over 1987 h of shelf life and 120 h of light soaking. The PSCs based on RGO have shown power conversion efficiency (PCE) of 6.6%, outperforming the ones achieved with the Spiro-OMeTAD (PCE=6.5%), after the shelf life test. The light soaking test confirmed the better durability of RGO-based PSCs with respect to the Spiro-OMeTAD ones, the latter showing a reduction in PCE 2.7 times higher than the RGO-based cells. Moreover, we demonstrate by Open Circuit Voltage Decay measurements that RGO, beside the HTM function, acts also as an anti-recombination layer, reducing the charge carriers recombination pathways and, hence, increasing their lifetime. © 2016 Elsevier Ltd.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/07 - Fondamenti Chimici delle Tecnologie
Settore ING-INF/01 - Elettronica
English
Con Impact Factor ISI
Durability; Graphene; Hole mobility; Open circuit voltage; Perovskite; Perovskite solar cells; Solar power generation; Testing, Ageing tests; Hole-transporting materials; Open circuit voltage decays; Photovoltaic devices; Power conversion efficiencies; Recombination layers; Reduced graphene oxides; Reduced graphene oxides (RGO), Solar cells; Ageing test; Hole transporting materials; Perovskite solar cell; Reduced graphene oxide
Palma, A.L., Cina', L., Pescetelli, S., Agresti, A., Raggio, M., Paolesse, R., et al. (2016). Reduced graphene oxide as efficient and stable hole transporting material in mesoscopic perovskite solar cells. NANO ENERGY, 22, 349-360 [10.1016/j.nanoen.2016.02.027].
Palma, Al; Cina', L; Pescetelli, S; Agresti, A; Raggio, M; Paolesse, R; Bonaccorso, F; DI CARLO, A
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/175283
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