Organo-metal halide perovskite-based solar cells with CuSCN as the inorganic hole selective contact

Abstract

CuSCN is proposed as a cost-competitive hole selective contact for the emerging organo-metal halide perovskite-based solar cells. The CuSCN films have been deposited by a solution casting technique, which has proven to be compatible with the perovskite films, obtaining planar-like heterojunction-based glass/FTO/TiO 2 /CH 3 NH 3 PbI 3Àx Cl x /CuSCN/Au solar cells with a power conversion efficiency of 6.4%.Among the photovoltaic parameters, the fill factor (i.e. 62%) suggests good carrier selectivity and, therefore, efficient functionality of the TiO 2 and CuSCN charge carrier selective contacts. However, the open-circuit voltage (V oc ), which remains low in comparison with the state of the art perovskite-based solar cells, appears to be the main limiting parameter. This is attributed to the short diffusion length as determined by impedance spectroscopy. However, the recombination losses are not only affected by the CuSCN, but also by the perovskite film. Indeed, variations of 20 C in the thermal annealing of the perovskite films result in changes larger than 200 mV in the V oc . Furthermore, a detailed analysis of the quantum efficiency spectra contributes significant insights into the influence of the selective contacts on the photocurrent of the planar heterojunction perovskite solar cells.

New iridium complex as additive to the spiro-OMeTAD in perovskite solar cells with enhanced stability

“…13,14 Precisely, the use of new materials or modifications as HTM is a very large field to be explored. It has been demonstrated the effective use of solution-processable inorganic HTM as CuI 15 and CuSCN, 16,17 reporting efficiencies as high as 12.4%. 17 Nevertheless the most extended HTM employed in PSCs are organic wherein the organic synthesis of conductive polymers or new molecules used as additives has a fundamental role.…”

Investigation of moisture stability and PL characteristics of terpineol-passivated organic–inorganic hybrid perovskite

“…Over the last few years, solar cells based on organicinorganic hybrid semiconductor materials with perovskite structure as light absorbers have been quickly progressing due to their excellent photovoltaic performance [1][2][3]. Perovskites were first utilized in dye sensitized solar cells with the perovskite being a replacement sensitizer for the standard molecular dyes.…”

Effect of different lead precursors on perovskite solar cell performance and stability

“…6,7 Since then, numerous research groups have focused their efforts on the development of different approaches to optimize this eld, mainly based on the use of different cell congurations (TiO 2 or Al 2 O 3 scaffolds or planar congurations with no scaffold), use of mixed halide (Br-I) derivatives of CH 3 NH 3 PbI 3 , [8][9][10] exchange of the organic cation CH 3 NH 3 + , [11][12][13][14] use of additives in the HTM 15,16 or use of different selective contacts. [17][18][19][20] In addition, high efficiency samples have been obtained from a broad variety of deposition techniques, including spin-coating 6,7 two step procedures involving dip-coating 21 or drop casting methods 22 and solvent engineering strategies.…”