Lead Halide Perovskite Quantum Dots To Enhance the Power Conversion Efficiency of Organic Solar Cells

Abstract

The facile synthesis, solution‐processability, and outstanding optoelectronic properties of emerging colloidal lead halide perovskite quantum dots (LHP QDs) makes them ideal candidates for scalable and inexpensive optoelectronic applications, including photovoltaic (PV) devices. The first demonstration of integrating CsPbI3 QDs into a conventional organic solar cell (OSC) involves embedding the LHP QDs in a donor–acceptor (PTB7‐Th:PC71BM) bulk heterojunction. Optimizing the loading amount at 3 wt %, we demonstrate a power conversion efficiency of 10.8 %, which is a 35 % increase over control devices, and is a record amongst hybrid ternary OSCs. Detailed investigation into the mechanisms behind the performance enhancement shows that increased light absorption is not a factor, but that increased exciton separation in the acceptor phase and reduced recombination are responsible.

An Organic–Inorganic Hybrid Material Based on Benzo[ghi]perylenetri-imide and Cyclic Titanium-Oxo Cluster for Efficient Perovskite and Organic Solar Cells

“…This remarkable enhancement of electron mobilities indicates that the new interlayer is able to improve the electron transport from the photoactive layers to the electrode. [56]…”

Efficient Hole Transfer via CsPbBr3 Quantum Dots Doping toward High‐Performance Organic Solar Cells

“…[44,52] The energy-level diagram shows the formation of asymmetric cascade alignment of HOMO levels in the active layer, suggesting that the incorporation of CsPbBr 3 PQDs has the potential to bridge the hole transfer process from Y6-BO to PM6 and reduce charge recombination. [42] To shine light on the effect of adding CsPbBr 3 PQDs toward the photon-to-electricity conversion process of the PM6:Y6-BO OSC, PL spectra (excited at 532 nm) of PM6:Y6-BO blend film with and without CsPbBr 3 PQDs addition were measured. As shown in Figure 5b, the pure Y6-BO film shows a distinct PL emission peak around 910 nm and the PM6 shows a wider PL emission peak at 700 nm.…”

“…For instance, Guijarro et al doped the PTB7-Th:PC 71 BM fullerene OSC with CsPbI 3 PQDs to improve exciton dissociation and suppress charge recombination, achieving increased PCE from 7.9% to 10.8%. [42] Zhan et al introduced the CsPbI 3 PQDs into PTB7-Th:FOIC nonfullerene OSC to reduce the nonradiative recombination loss, promote light absorption, form charge transfer between PQDs and FOIC as well as FRET from PQDs to PTB7-Th, resulting in an increased PCE from 11.6% to 13.2%. However, decreased device stability was observed after the addition of CsPbI 3 PQDs, when the OSCs were not encapsulated.…”

High‐Efficiency Perovskite Quantum Dot Hybrid Nonfullerene Organic Solar Cells with Near‐Zero Driving Force

“…[ 28–31 ] CsPbI 3 perovskite quantum dots (PQDs) were used for perovskite solar cells, [ 32–36 ] light‐emitting diodes, [ 37–39 ] and even fullerene‐based OSCs. [ 40 ]…”

“…This suggests that exciton separation is highly efficient in the hybrid solar cells, likely due to the cascade band structure and increased molecular order, which in turn facilitate charge separation, transport, and extraction. According to the report by Guijarro et al, [ 40 ] recombination losses can effectively be prevented through screening the Coulombic interactions in the active layers due to the presence of PQDs that possess a much higher dielectric constant than the organic materials.…”