Quaternary copper chalcogenide Cu2ZnSnS4 (CZTS) nanoparticles (NPs) were synthesized with the sol-gel technique and used as the hole-transporting layer (HTL), achieving a power-conversion efficiency (PCE) of 13.41 %, which is the highest PCE for Cu-based inorganic HTLs. The effects of the CZTS HTL on the optical absorption, crystallinity, crystal plane orientation and hysteresis of the J-V curve for the devices with a perovskite film were investigated and compared with spiro-OMeTAD, revealing the role of CZTS in efficient hole transporting in perovskite solar cells. In addition to the traditional use of the light absorber, this study reveals a new role of CZTS in photovoltaics, acting as an HTL, providing a completely different insight into the CZTS development. Keywords: Cu 2 ZnSnS 4 , perovskite, solar cells, hole-transporting layer Avtorji prispevka so sintetizirali nanodelce (NPs; angl.: Nano-Particles) kvaternarnega bakrovega halkogenida Cu2ZnSnS4 (CZTS) s sol-gel tehniko in jih uporabili kot transportno plast za praznine (HTL; angl.: hole transporting layer). S tem so dosegli 13,41 % u~inkovitost pretvorbe mo~i (PCE; angl.: Power Conversion Efficiency), kar je do sedaj najvi{ja dose`ena PCE z anorganskimi HTL-ji na osnovi Cu. Avtoriji so raziskali vpliv CZTS HTL na opti~no absorpcijo, kristalini~nost, orientacijo kristalne ravnine in histerezo J-V krivulje za naprave s perovskitnim filmom in ga primerjali s spiro-OMeTAD ter odkrili vlogo CZTS pri u~inkovitosti transporta praznin v perovskitnih son~nih celicah. Ta {tudija, dodatno k tradicionalni uporabi svetlobnih absorberjev, odkriva nov pomen CZTS v fotovoltaiki kot HTL, kar omogo~a popolnoma nov pogled v razvoju CZTS.
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