Improved UV sensitivity and charge transport in PTB7-Th:PC₇₁BM solar cells doped with cadmium selenide quantum dots

Abstract

Three chromium selenide quantum dots (CdSe QDs) with different emissions have been incorporated into PTB7-Th:PC71BM BHJ active layers to fabricate polymer solar cells (PSCs). It was proved that CdSe QDs...

Stratified Oxygen Vacancies Enhance the Performance of Mesoporous TiO2 Electron Transport Layer in Printable Perovskite Solar Cells

“…Intensity‐modulated photocurrent spectroscopy (IMPS) and intensity‐modulated photovoltage spectroscopy (IMVS) were also performed. [ 46–48 ] The electron transfer time τ d was estimated from the equation τ d = 1/(2 π f d,min ), where f d,min is the corresponding frequency at minimum in the IMPS plots (Figure 4d). Accordingly, the corresponding electron transport times were 1.38 µs and 1.56 µs in the devices with the RO‐TiO 2 and TiO 2 ETL, respectively.…”

Enhanced Collection of Photocurrents Using Core–Shell Quantum Dots Decorated Polymer Composite Films

“…45,46 SQDs of these materials, however, change properties due to the quantum size effect (QSE) as it is a wellknown fact that SQD produces a broad optical spectrum with the lowest size of about 2 nm emitting blue light, while a size in the order of 10 nm gives off a red color. 47 These combined effects of core−shell SQDs can be used to broaden optical absorption spectra and capture high photon energy, resulting in an improved solar cell performance. The microwavesynthesized SQD has been widely reported to yield small inorganic particles with a uniform distribution of particle sizes, high purity, fast reaction time, better control of aggregation, as well as cost-effectiveness.…”

“…The SQDs employed in this study are group II–VI cadmium sulfide (Cd x S) - core and zinc sulfide (Zn 1– x S) - shell with different ratios of group II metals. The energy bandgap of CdS and ZnS bulk semiconductors are 2.4 and 3.6 eV, respectively. , SQDs of these materials, however, change properties due to the quantum size effect (QSE) as it is a well-known fact that SQD produces a broad optical spectrum with the lowest size of about 2 nm emitting blue light, while a size in the order of 10 nm gives off a red color . These combined effects of core–shell SQDs can be used to broaden optical absorption spectra and capture high photon energy, resulting in an improved solar cell performance.…”

Self-Supplied Electron Photoelectrochemical Biosensor with PTB7-Th as a Photoelectric Material and Biotin as an Efficient Quencher

“…Comparatively, the constructed PEC sensing platform on the basis of a donor–acceptor (D-A)-type photoelectric material could acquire a stable PEC signal independent of the addition of any electron donor or acceptor . Specifically, a D-A-type photoelectric material integrates donor units and acceptor units in a single molecule with an intramolecular electron transport procedure that promotes the electron transport rate, reduces power dissipation, and improves photoelectric conversion performance. − Of these, PTB7-Th, poly­{4,8-bis­[5-(2-ethylhexyl) thiophen-2-yl]­benzo­[1,2- b :4,5- b ′] dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)­carbonyl] thieno­[3,4- b ]-thiophene-4,6-diyl}, is considered to be one of the most promising D-A-type photoelectric materials due to its herein distinguished photoelectric property. − Inspired by the inherent features of PTB7-Th, herein, it is expected to construct an accurate and sensitive PEC biosensor based on D-A-type PTB7-Th to achieve sensitive detection of Pb 2+ , which could simplify preparation procedures, decrease energy wastage, and promote photoelectric conversion rate.…”