Fig. 3: Device architecture and photovoltaic performance. | Nature Energy

Fig. 3: Device architecture and photovoltaic performance.

From: Large guanidinium cation mixed with methylammonium in lead iodide perovskites for 19% efficient solar cells

Fig. 3

a, Device architecture of the perovskite solar cells incorporating Gua cations (glass/FTO/c-TiO2/mp-TiO2/perovskite/spiro-OMeTAD/Au). b, Statistical data for J sc, V oc, FF and PCE obtained from more than 120 cells (at least 17 cells per condition) prepared with MA1–x Gua x PbI3 as a function of x. The top bar shows the maximum value, the bottom bar shows the minimum value, the circle shows the mean value and the dashed rectangle shows the region containing 25–75% of the data, obtained for each condition. c, EQE spectra of mixed MA1–x Gua x PbI3 (x = 0.14, 0.17 and 0.25) and that incorporating 50% Gua. The result for MAPbI3 (0%) is also included as a reference.

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