Graphdiyne Quantum Dots for Much Improved Stability and Efficiency of Perovskite Solar Cells

Abstract

Comparing to other carbon materials, the general graphyne structure is much superior in terms of adaptable bandgap, uniformly distributed pores, more design flexibility, easier for chemical synthesis, pliable electronic properties, and smaller atomic density. Herein, novel γ‐graphdiyne quantum dots (GD QDs) are used in perovskite solar cells as a surface modifier or dopant to TiO2, CH3NH3PbI3, and Spiro‐OMeTAD to realize multiple advantageous effects, in hoping that it would form a more effective carrier transport channel for boosted solar cell performance. First, the presence of GD QDs on TiO2 surface increases perovskite grain size for higher current density and fill factor. Second, the GD QDs at each interface reduce the conduction band offset, passivate the surface for suppressed carrier recombination to attain higher open‐circuit voltage. Third, it improves hydrophobicity and eliminates pinholes in the Spiro‐OMeTAD film for enhanced solar cell stability. As a result, the optimized device shows >15% enhancement in power conversion efficiency (from 17.17 to 19.89%) comparing to the reference device. More significantly, the device stability was improved in harsh environment (moist air, UV irradiation, or thermal conditions). It is expected that GD QDs will find their applications in efficient and stable perovskite solar cells and optoelectronic devices.

Synergy of Hydrophobic Surface Capping and Lattice Contraction for Stable and High‐Efficiency Inorganic CsPbI2Br Perovskite Solar Cells

“…In a typical PSC, the perovskite absorber is confined between an electron transport layer (ETL) and a hole transport layer (HTL) . The above‐mentioned phase transition in humid conditions usually began at the interface between the perovskite and the HTL for water diffusion through the HTL layer.…”

All‐Inorganic CsPbX3 Perovskite Solar Cells: Progress and Prospects

“…Third generation cells include arange of thin-film cells,including dye-sensitized, [4] polymer, [5] quantum dot, [6] and halide perovskite (HaP) cells. [7] TheH aPs, which are the subject of this Review,a re ap articularly exciting set of semiconductors combining many excellent properties at the same time,i ncluding large carrier diffusion lengths (due mainly to long charge lifetimes), tolerance to defects/low defect densities and large optical absorption coefficients near the band gap. [8] In fact, since its discovery in 2009, the efficiencyo fH aP solar cells has increased from 3.8 %to23.7 %.…”

Anorganische CsPbX3‐Perowskit‐Solarzellen: Fortschritte und Perspektiven

“…Tatsächlich wurden allein im Jahr 2017 weltweit über 100 GW Solarmodule installiert, wobei der Markt immer noch von kristallinen Silicium-Modulen, den Solarzellen der ersten Generation, beherrscht wird. [3] Sie machten 2017 rund 5%der insgesamt hergestellten Module aus.Z ud en Zellen dritter Generation gehçren eine Reihe von Dünnschichtzellen, darunter farbstoffsensibilisierte, [4] Polymer-, [5] Quantenpunkt- [6,7] und Halogenidperowskit(HaP)-Zellen. Hinzu kommen anwendungsabhängige Nachteile wie die relativ schlechte Leistung bei hohen Te mperaturen und unter schwachen Lichtverhältnissen sowie ihre starre und relativ schwer Bauart.…”

“…[2] Dünnschichtsolarzellen auf Basis von amorphem Si, CdTeo der Cu(In,Ga)Se 2 bilden die zweite Generation kommerzieller Zellen. [3] Sie machten 2017 rund 5%der insgesamt hergestellten Module aus.Z ud en Zellen dritter Generation gehçren eine Reihe von Dünnschichtzellen, darunter farbstoffsensibilisierte, [4] Polymer-, [5] Quantenpunkt- [6,7] und Halogenidperowskit(HaP)-Zellen. HaPs,d ie Thema dieses Aufsatzes sind, sind eine besonders spannende Gruppe von Halbleitern, die viele hervorragende Eigenschaften in sich vereinen, z.…”