Two‐dimensional Transition metal Dichalcogenides as an Emerging Platform for Singlet Fission Solar Cells

Abstract

Singlet fission, a rapid exciton doubling process via inverse Auger recombination, is recognized as one of the most practical and feasible means for overcoming the Shockley–Queisser limit. Singlet fission solar cells are generally developed by integrating photon downconversion organic semiconductors into conventional photovoltaic devices to break the maximum photovoltaic response of the host semiconductors by virtue of extra triplet excitons. In this regard, proper matching of two different semiconductors and heterointerface engineering are both crucial for highly efficient singlet fission solar cells. Therefore, the aim of this study is to review the prerequisite conditions for efficient triplet transfer at the heterointerfaces and thus highlight the robust spin and valley degrees of freedom of transition metal dichalcogenides with the ultimate goal of stimulating research into next‐generation singlet fission solar cells.

van der Waals 2D transition metal dichalcogenide/organic hybridized heterostructures: recent breakthroughs and emerging prospects of the device

“…These hybrids find use in photovoltaics, light-emitting transistors, and other organic electronics. 24–28 In all the cases, the choice of organic molecules should consider their compatibility with the 2D TMD surface, the intended application, and the desired chemical and physical properties of the resulting composite material. Surface functionalization techniques such as chemical modification or physical adsorption are often employed to achieve the desired interactions between organic molecules and 2D TMDs.…”

Efficient generation of singlet oxygen due to localized surface plasmon resonance of silver nanoparticles in rose bengal–silver nanoparticle composite films

“…[27][28][29] Singlet exciton fission (SF) is a process in which a singlet molecular excited state splits into two triplet excited states. [30][31][32][33][34] Hence, the SF is expected to surmount the Shockley-Queisser efficiency limit for a solar cell containing a single optimized semiconductor junction. From this viewpoint, an external quantum efficiency above 100% in organic photovoltaic cells has been reported using SF in several papers.…”

Developments and Challenges Involving Triplet Transfer across Organic/Inorganic Heterojunctions for Singlet Fission and Photon Upconversion

“…This so-called Shockley–Queisser limit amounts to 33% for solar cells based on Si . Triplets can help utilize this unexploited energy through two mechanisms: (1) singlet fission to avoid thermal loss from higher-energy photons − and (2) triplet–triplet annihilation upconversion (TTA-UC) − to harvest lower-energy near-infrared (NIR) photons by converting them to visible photons. Starting from a 28% efficiency of a base Si solar cell, the exploitation of singlet fission can increase the efficiency to 36% and photon upconversion to 48% .…”

“…This orientation leads to small electronic coupling and poor triplet transfer, as in the case for Si discussed above. TMDCs can also be used as potential sensitizers with singlet-fission organics . Jang et al.…”

“…TMDCs can also be used as potential sensitizers with singlet-fission organics. 5 Jang et al. demonstrated electron transfer from the triplet states in pentacene (triplet energy 0.86 eV) to MoTe 2 (band gap 1.1 eV) doubling the photocurrent in a bilayer device.…”