Kyeongsu Kim1,Jae Woong Jung1,Jung Jae Do1
Kyung Hee University1
Kyeongsu Kim1,Jae Woong Jung1,Jung Jae Do1
Kyung Hee University1
Recently, organic-inorganic hybrid perovskite solar cells (PSCs) received significant attention due to its remarkable progress on record-breaking efficiency of perovskite photovoltaics. P-type metal oxides are an interesting class for robust HTLs of high performance PSCs with high durability, however poor surface morphology and low conductivity are unsatisfactory to achieve ideal optoelectronic properties as HTLs. To overcome these issues, we suggest straightforward strategy of interface modification of metal oxide surface using self-assembled molecule (SAMs) The anchoring the phosphonic acid moiety of SAM form ideal linkage to the metal oxide surface, realizing optimal hole transport pathway at the interface of perovskite absorber and metal oxide HTLs. Moreover, the defect sites at the interface of perovskite/metal oxides successfully passivated by SAMs, providing reduced defect-assisted charge-carrier recombination. As a result, the SAM-passivated NiO<sub>x</sub> achieves FA<sub>0.85</sub>Cs<sub>0.15</sub>PbI<sub>3</sub>-based PSCs up to >20% efficiency. There is significant improvement on photovoltaic performances under dim indoor light-emitting diode (LED) conditions (6500 K 1000 lux), 27.19%, 24.84% and 16.05%, NiO<sub>x</sub>/MeO-2PACz, NiO<sub>x</sub> and MeO-2PACz each. Details of device and film analyses will be discussed in the presentation.