The materials that might become part of inexpensive tandem-junction solar cells could end up being wildly different from each other. These materials may have crystal structures that don’t align with each other. Misaligned atoms means chemical defects, chemical defects mean electronic defects, and electronic defects are bad, m’kay?
Organic monolayers are uniquely positioned to chemically bond to each material, be electrically conductive, and have tunable energy levels to enable carrier selectivity. Challenges lie in attaching the organics correctly, understanding how each layer affects the electronic properties of adjacent laters, and putting the second material on top of the organic layer in a way that doesn’t wreck everything.
Here are some papers that we have recently published in this area:
Open-Circuit Photovoltage Exceeding 950 mV with an 840 mV Average at Sb2S3–Thianthrene+/0 Junctions Enabled by Thioperylene Anhydride Back Contacts.
Curtis W. Doiron, Nicholas A. Fitzpatrick, Clare P. Masucci, Julia L. Martin, Alexander D. Carl, and Ronald L. Grimm
ACS Omega, 2020, 5, 16875–16884.
Covalent Attachment and Characterization of Perylene Monolayers on Si(111) and TiO2 for Electron-Selective Carrier Transport.
Alexander D. Carl and Ronald L. Grimm
Langmuir, 2019, 35(29), 9352–9363.
Synthesis and Characterization of Alkylamine-Functionalized Si(111) for Perovskite Adhesion with Minimal Interfacial Oxidation or Electronic Defects.
Alexander D. Carl, Roghi E. Kalan, John David Obayemi, Martiale Gaetan Zebaze Kana, Winston Oluwole Soboyejo, and Ronald L. Grimm.
ACS Appl. Mater. Interfaces, 2017, 9(39), 34377-34388. 10.1021/acsami.7b07117