Nanoconfining solution-processed organic semiconductors for emerging optoelectronics

Zhang, Yuze; Chen, Alina; Kim, Min Woo; Alaei, Aida; Lee, Stephanie S.

doi:10.1039/d1cs00430a

Cited by 20 publications

(20 citation statements)

References 73 publications

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“…80,81 Recently a large number of organic semiconductors were explored with the scope of replacing rigid crystalline silicon-based semiconductors, which requires extremely high purity and precise processing technology. [82][83][84] The Electronic Industries Alliance (EIA) composed of electronic manufacturers has developed a standard for semiconductors, which should have the surface resistivity in the range of 10 5 -10 13 Ω sq −1 . In particular, highly conjugated systems such as perylenes, pentacenes, phenylene vinylenes, pyrenes and naphthalene derivatives were largely explored; however, the use of concept of molecular self-assembly of naphthalimides in semiconductor fabrication is limited.…”

Section: Resultsmentioning

confidence: 99%

A facile synthesis of amphiphilic N-glycosyl naphthalimides and fabrication of flexible semiconductors using molecular self-assembly

et al. 2022

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Section: Resultsmentioning

confidence: 99%

A facile synthesis of amphiphilic N-glycosyl naphthalimides and fabrication of flexible semiconductors using molecular self-assembly

et al. 2022

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“…As crystal sizes are reduced, the surface free energy contribution to the total Gibbs free energy relative to the volume free energy of the crystals increases, resulting in shifts in polymorph transition temperatures. [ 37 ] In electrospun OTP nanofibers, crystal sizes are limited to the fiber diameter (≈200 nm). This crystal size reduction likely improves the phase stability of OTP nanofibers compared to planar OTP films.…”

Section: Resultsmentioning

confidence: 99%

Electrospun Tri‐Cation Perovskite Nanofibers for Infrared Photodetection

Kim

Yuan

Jeong

et al. 2022

Adv Funct Materials

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Tri‐cation (Cs+/CH3NH3+/CH(NH2)2+) and dual‐anion (Br–/I–) perovskites are promising light absorbers for inexpensive infrared (IR) photodetectors but degrade under prolonged IR exposure. Here, stable IR photodetectors based on electrospun tri‐cation perovskite fibers infiltrated with hole‐transporting π‐conjugated small molecule 2,2′,7,7′‐tetrakis[N,N‐di(4‐methoxyphenyl)amino]‐9,9‐spirobifluorene (Spiro‐OMeTAD) are demonstrated. These hybrid perovskite photodetectors operate at a low bias of 5 V and exhibit ultra‐high gains with external quantum efficiencies (EQEs) as high as 3009%, decreasing slightly to ≈2770% after 3 months in air. These EQE values are almost ten times larger than those measured for photodetectors comprising bilayer perovskite/Spiro‐OMeTAD films. A high density of charge traps on electrospun fiber surfaces gives rise to a photomultiplication effect in which photogenerated holes can travel through the active layer multiple times before recombining with trapped electrons. Time‐resolved photoluminescence and conductive atomic force microscopy mapping reveal the improved performance of electrospun fibers to originate from the significantly enhanced interfacial surface area between the perovskite and Spiro‐OMeTAD compared to bilayers. As a solution‐based, scalable and continuous method of depositing perovskite layers, electrospinning thus presents a promising strategy for the inexpensive fabrication of high‐performance IR photodetectors for applications ranging from information technology to imaging.

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“…), 90 − 92 tailor-made additives, 93 , 94 solution shearing, 95 , 96 epitaxial templating, 97 and nanoscale confinement. 98 − 101 If packing motifs correlated with desirable properties are predicted to be too high in energy to be synthesizable for a parent compound, they may be achieved by chemical modifications, such as functionalization with side groups. 45 , 129 − 131 , 141 We note, however, that CSP often produces more putative structures than are realized experimentally.…”

Section: Discussionmentioning

confidence: 99%

Inverse Design of Tetracene Polymorphs with Enhanced Singlet Fission Performance by Property-Based Genetic Algorithm Optimization

et al. 2023

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The efficiency of solar cells may be improved by using singlet fission (SF), in which one singlet exciton splits into two triplet excitons. SF occurs in molecular crystals. A molecule may crystallize in more than one form, a phenomenon known as polymorphism. Crystal structure may affect SF performance. In the common form of tetracene, SF is experimentally known to be slightly endoergic. A second, metastable polymorph of tetracene has been found to exhibit better SF performance. Here, we conduct inverse design of the crystal packing of tetracene using a genetic algorithm (GA) with a fitness function tailored to simultaneously optimize the SF rate and the lattice energy. The property-based GA successfully generates more structures predicted to have higher SF rates and provides insight into packing motifs associated with improved SF performance. We find a putative polymorph predicted to have superior SF performance to the two forms of tetracene, whose structures have been determined experimentally. The putatuve structure has a lattice energy within 1.5 kJ/mol of the most stable common form of tetracene.

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Nanoconfining solution-processed organic semiconductors for emerging optoelectronics

Abstract: This tutorial review highlights the role of nanoconfinement in selecting for orientations and polymorphs of organic semiconductor crystals that are optimized for optoelectronic processes, including charge transport and light emission.

Cited by 20 publications

References 73 publications

A facile synthesis of amphiphilic N-glycosyl naphthalimides and fabrication of flexible semiconductors using molecular self-assembly

A facile synthesis of amphiphilic N-glycosyl naphthalimides and fabrication of flexible semiconductors using molecular self-assembly

Electrospun Tri‐Cation Perovskite Nanofibers for Infrared Photodetection

Inverse Design of Tetracene Polymorphs with Enhanced Singlet Fission Performance by Property-Based Genetic Algorithm Optimization

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