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1. Series Resistance Measurements of Perovskite Solar Cells Using J_sc – V_oc Measurements

   https://doi.org/10.1002/solr.201800378  

   Mundhaas, Noemi; Yu, Zhengshan J.; Bush, Kevin A.; Wang, Hsin‐Ping; Häusele, Jakob; Kavadiya, Shalinee; McGehee, Michael D.; Holman, Zachary C. (March 2019, Solar RRL)
2. In Situ Biomineralization of Cu _x Zn _y Sn _z S ₄ Nanocrystals within TiO ₂ -Based Quantum Dot Sensitized Solar Cell Anodes

   https://doi.org/10.1021/acsami.9b15545  

   Sadeghnejad, Abdolhamid; Lu, Li; Cline, Joseph; Ozdemir, Nur K.; Snyder, Mark A.; Kiely, Christopher J.; McIntosh, Steven (November 2019, ACS Applied Materials & Interfaces)
3. Rationally Engineered Vertically Aligned β ‐Ga _{2− x} W _x O ₃ Nanocomposites for Self‐Biased Solar‐Blind Ultraviolet Photodetectors with Ultrafast Response

   https://doi.org/10.1002/admt.202300014  

   Das, Debabrata; Sanchez, Francelia; Barton, Dallin_J; Tan, Susheng; Shutthanandan, Vaithiyalingam; Devaraj, Arun; Ramana, Chintalapalle_V (May 2023, Advanced Materials Technologies)

   Abstract With the astonishing advancement of present technology and increasing energy consumption, there is an ever‐increasing demand for energy‐efficient multifunctional sensors or transducers based on low‐cost, eco‐friendly material systems. In this context, self‐assembled vertically alignedβ‐Ga_2−xW_xO₃nanocomposite (GWO‐VAN) architecture‐assisted self‐biased solar‐blind UV photodetection on a silicon platform, which is the heart of traditional electronics is presented. Utilizing precisely controlled growth parameters, the formation of W‐enriched verticalβ‐Ga_2−xW_xO₃nanocolumns embedded into the W‐deficientβ‐Ga_2−xW_xO₃matrix is reached. Detailed structural and morphological analyses evidently confirm the presence ofβ‐Ga_2−xW_xO₃nanocomposite with a high structural and chemical quality. Furthermore, absorption and photoluminescence spectroscopy explains photo‐absorption dynamics and the recombination through possible donor–acceptor energy states. The proposed GWO‐VAN framework facilitates evenly dispersed nanoregions with asymmetric donor energy state distribution and thus forms build‐in potential at the verticalβ‐Ga_2−xW_xO₃interfaces. As a result, the overall heterostructure evinces photovoltaic nature under the UV irradiation. A responsivity of ≈30 A/W is observed with an ultrafast response time (≈350 µs) under transient triggering conditions. Corresponding detectivity and external quantum efficiency are 7.9 × 10¹²Jones and 1.4 × 10⁴%, respectively. It is believed that, while this is the first report exploiting GWO‐VAN architecture to manifest self‐biased solar‐blind UV photodetection, the implication of the approach is enormous in designing electronics for extreme environment functionality and has immense potential to demonstrate drastic improvement in low‐cost UV photodetector technology. 

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4. Solar CO₂ reduction using a molecular Re(I) catalyst grafted on SiO₂ via amide and alkyl amine linkages

   https://doi.org/10.1039/d3dt03623e  

   Fenton, Thomas; Ahmad, Esraa; Li, Gonghu (February 2024, Dalton Transactions)

   Heterogenized molecular catalysts have shown interesting activities in different chemical transformations. In our previous studies, a molecular catalyst, Re(bpy)(CO)3Cl where bpy is 2,2’-bipyridine, was covalently attached to silica surfaces via an amide linkage for use in photocatalytic CO2 reduction. Derivatizing the bpy ligand with electron-withdrawing amide groups led to detrimental effects on the catalytic activity of Re(bpy)(CO)3Cl. In this study, an alkyl amine linkage is utilized to attach Re(bpy)(CO)3Cl onto SiO2 in order to eliminate the detrimental effects of the amide linkage by breaking the conjugation between the bpy ligand and the amide group. However, the heterogenized Re(I) catalyst containing the alkyl amine linkage demonstrates even lower activity than the one containing the amide linkage in photocatalytic CO2 reduction. Infrared studies suggest that the presence of the basic amine group led to the formation of a photocatalytically inactive Re(I)-OH species on SiO2. Furthermore, the amine group likely contributes to the stabilization of a surface Re(I)-carboxylato species formed upon light irradiation, resulting in the low activity of the heterogenized Re(I) catalyst containing the alkyl amine linkage. 

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5. Harnessing near-infrared light via S ₀ to T ₁ sensitizer excitation in a molecular photon upconversion solar cell

   https://doi.org/10.1039/D1TC05270E  

   Beery, Drake; Arcidiacono, Ashley; Wheeler, Jonathan P.; Chen, Jiaqi; Hanson, Kenneth (March 2022, Journal of Materials Chemistry C)

   Integrating molecular photon upconversion via triplet–triplet annihilation (TTA-UC) directly into a solar cell offers a means of harnessing sub-bandgap, near infrared (NIR) photons and surpassing the Shockley–Queisser limit. However, all integrated TTA-UC solar cells to date only harness visible light. Here, we incorporate an osmium polypyridal complex (Os) as the triplet sensitizer in a metal ion linked multilayer photoanode that is capable of harnessing NIR light via S 0 to T 1 * excitation, triple energy transfer to a phosphonated bis(9,10-diphenylethynyl)anthracene annihilator (A), TTA-UC, and electron injection into TiO 2 from the upcoverted state. The TiO 2 -A-Zn-Os devices have five-fold higher photocurrent (∼3.5 μA cm −2 ) than the sum of their parts. IPCE data and excitation intensity dependent measurements indicate that the NIR photons are harvested through a TTA-UC mechanism. Transient absorption spectroscopy is used to show that the low photocurrent, as compared to visible light harnessing TTA-UC solar cells, can be atributed to: (1) slow sensitizer to annihilator triplet energy transfer, (2) a low injection yield for the annihilator, and (3) fast back energy transfer from the upconverted state to the sensitizer. Regardless, these results serve as a proof-of-concept that NIR photons can be harnessed via an S 0 to T 1 * sensitizer excited, integrated TTA-UC solar cell and that further improvements can readily be made by remedying the performance limiting processes noted above. 

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