Alloy-tuned Carbon Electrode Work Function Improves Charge Extraction In Inorganic Perovskite Solar Cells-Qiming Carbon

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Alloy-tuned Carbon Electrode Work Function Improves Charge Extraction In Inorganic Perovskite Solar Cells

Apr,27,2023

In recent years, all-inorganic perovskite solar cells (PSCs) based on light-absorbing layers have attracted close attention from researchers due to their excellent chemical stability and low cost, and their photoelectric conversion efficiency has continued to rise and record. It is found that the charge extraction ability of inorganic PSC devices plays a key role in improving photoelectric conversion efficiency. Classical inorganic PSC devices employ a thin film as the light-absorbing layer with a valence band energy level of −5.6 eV, and the 0.6 eV energy difference of −5.0 eV generated by the work function of the carbon electrode makes charge extraction difficult and limits the photovoltaic performance. Therefore, how to achieve efficient charge extraction is one of the research hotspots in the field of all-inorganic PSCs.

All-inorganic PSC device structure and PtNi alloy morphology

(a) Schematic of the device structure of the all-inorganic PSC.

(b) SEM cross-sectional image of the all-inorganic PSC.

Screen printing carbon electrode_polishing glassy carbon electrode solution configuration_carbon electrode

(d)–(e) Morphology of PtNi alloy.

Photovoltaic performance of all-inorganic PSC devices and work function of PtNi alloy

(a) JV curves of all-inorganic PSC devices decorated with different PtNi alloys.

(b) IPCE spectra of all-inorganic PSCs.

(c)–(f) Work function spectra of PtNi alloy doped carbon electrodes.

carbon electrode_polishing glassy carbon electrode solution configuration_screen printing carbon electrode

(g) Schematic diagram of the energy level structure and charge transport of the all-inorganic PSC.

Charge extraction performance of all-inorganic PSCs

(a)–(b) Recombination current and voltage of the all-inorganic PSC device.

(d) Transient fluorescence spectrum of the battery device.

polishing glassy carbon electrode solution configuration_screen printing carbon electrode_carbon electrode

Battery Performance and Stability

(a) JV curves of all-inorganic PSCs modified with carbon quantum dots interface.

(b) IPCE of the all-inorganic PSCs interface modified with carbon quantum dots.

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