Abstract
We have fabricated organic-inorganic hybrid perovskite solar cell that uses a Ti/Au multilayer as cathode and does not use electron transport materials, and achieved the highest power conversion efficiency close to 13% with high reproducibility and hysteresis-free photocurrent curves. Our cell has a Schottky planar heterojunction structure (ITO/PEDOT:PSS/perovskite/Ti/Au), in which the Ti insertion layer isolate the perovskite and Au layers, thus proving good contact between the Au and perovskite and increasing the cells’ shunt resistance greatly. Moreover, the Ti/Au cathode in direct contact with hybrid perovskite showed no reaction for a long-term exposure to the air, and can provide sufficient protection and avoid the perovskite and PEDOT:PSS layers contact with moisture. Hence, the Ti/Au based devices retain about 70% of their original efficiency after 300 h storage in the ambient environment.
Highlights
We have fabricated organic-inorganic hybrid perovskite solar cell that uses a Ti/Au multilayer as cathode and does not use electron transport materials, and achieved the highest power conversion efficiency close to 13% with high reproducibility and hysteresis-free photocurrent curves
Organic-inorganic hybrid perovskite materials (MAPbX3, X =halogen), which are composed of Earth-abundant materials and can be deposited by low-temperature solution methods, have attracted much attention for fabricating low-cost solar cells[1,2], In the past six years, the power conversion efficiency (PCE) of perovskite solar cells (PSCs) has surged from 3.8% to over 23%3,4
Hole transport material (HTM)-free PSC is the most commonly used structure, which discard spiro-OMeTAD in the normal structures, with the highest PCE of about 12.8%9–11
Summary
PEDOT:PSS (Clevious P VP AI 4083) was spin-coated on clean ITO substrates at a speed of 3000 revolutions per minute (r.p.m.) for 60 s, and annealed at 120 °C for 30 min. The MAPbI3films (~350 nm) were fabricated by two-step spin-coating procedures in a nitrogen-filled glovebox (
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