Efficient Semitransparent CsPbI₃ Quantum Dots Photovoltaics Using a Graphene Electrode

Abstract

Solution‐processed perovskite quantum dots (QDs) are promising candidates for fabrication of semitransparent and tandem solar cells due to the bandgap tunability. In this work, cesium lead triiodide (CsPbI3) QDs are synthesized with a stable cubic phase and efficient perovskite solar cells (PSCs) are fabricated using the ligand exchange technique. Monolayer graphene is grown by chemical vapor deposition technique and a dry process to transfer graphene on top of the device is developed. Based on this approach, an efficient inverted PSC is demonstrated with a high average visible transmittance (AVT). After optimization, PSCs based on silver and graphene electrodes with power conversion efficiencies (PCEs) of 9.6% and 6.8% are achieved, respectively. Additionally, by tuning the thickness of the active layer, a PSC with PCE of 4.95% and AVT of 53% is demonstrated, indicating the potential of CsPbI3 QDs for the fabrication of semitransparent devices applicable in windows.

Ambient Fabrication of Organic–Inorganic Hybrid Perovskite Solar Cells

“…[ 7 ] This clearly indicates that c‐Si PV is a mature technology and there is limited room for improvement. [ 8 ] Over the past two decades, third‐generation solar cells such as dye‐sensitized solar cells, [ 9,10 ] quantum dot solar cells, [ 11,12 ] organic solar cells, [ 13,14 ] and perovskite solar cells (PSCs) [ 15,16 ] have been developed as alternatives to c‐Si technologies. Of these third‐generation solar cells, single‐junction PSCs have generated significant attention due to their intense visible to near‐infrared absorptivity, [ 16–18 ] long diffusion lengths of the charge carriers, [ 19,20 ] high efficiency, [ 21,22 ] electronic and physical tunability, [ 23,24 ] and low manufacturing costs.…”

Recent Progress on Advanced Optical Structures for Emerging Photovoltaics and Photodetectors

“…To realize semitransparency in OPVs and PSCs, one can manipulate the coverage, [ 35–43,161–163 ] thickness, [ 10–17,44–48,164,165 ] or bandgap of the active layer [ 2,8,9,18–24,49,50,166–168 ] or replace the opaque metal electrode with light‐transmitting media (e.g., metal nanowires, [ 44,46,51–56,169–171 ] transparent conducting oxides, [ 43,57–61,167,168,172–180 ] transparent conducting polymers, [ 40,62,63,181–184 ] graphene, [ 54,64,164,185 ] and carbon nanotube [ 65,186–188 ] ). Although the most convenient way to fabricate an ST‐PV is to decrease the thickness of the top metal electrode and, thereby, increase its transparency, [ 35,39,40,47,58,66–72,124 ] there is always a trade‐off between conductivity and transparency.…”

“…Plot of PCE with respect to AVT for ST‐OPVs and ST‐PSCs reported in the literature. [ 1,9–12,15,17,18,20–22,24,33–110 ] …”

Efficient and Stable Mesoscopic Perovskite Solar Cells Using a Dopant‐Free D–A Copolymer Hole‐Transporting Layer

“…Although many researchers have focused on this issue, the PSCs still suffer from poor stability as compared with the commercialized silicon solar cells. [ 19–22 ]…”