{"product_id":"rs-2","title":"RS-2","description":"\u003ch2 id=\"product-oneliner\"\u003eFor Perovskite Solar Cells with High Photothermal and Electrochemical Stability\u003c\/h2\u003e\n\u003cp class=\"text-center\"\u003eSuitable for large-area solution processing\u003c\/p\u003e\n\u003chr\u003e\n\u003cp class=\"text-center\"\u003e\u003ca href=\"#specifications\"\u003eProduct Information\u003c\/a\u003e | \u003ca href=\"#msds\"\u003eMSDS\u003c\/a\u003e | \u003ca href=\"#literature\"\u003eLiterature\u003c\/a\u003e | \u003ca href=\"#related-products\"\u003eRelated Products\u003c\/a\u003e | \u003ca href=\"#technical-support\"\u003eTechnical Support\u003c\/a\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003cp\u003eRS-2 is a self-assembled monolayer material with a cyanovinyl phosphonic acid (CPA) anchor group, a rigid conjugated phenyl linker, and a phenoxazine terminal. Adopting a coplanar donor-acceptor strategy, the electron-rich methoxyphenyl phenoxazine acts as the donor and cyanophosphonic acid as the acceptor to facilitate hole transport across the self-assembled thin layer between the substrate and perovskite active layer. With the introduction of the molecular steric hindrance, RS-2 diradical thin film exhibits improved assembly uniformity and large-area solution processability with high photothermal and electrochemical stability.\u003c\/p\u003e\n\u003cp\u003eA perovskite solar cell based on RS-2 as the hole selection layer demonstrates a champion power conversion efficiency (PCE) of 26.3% while retaining \u0026gt;97% of its initial efficiency after 2000h of operational tracking at 45°C. In addition, a perovskite-silicon tandem device (1 cm\u003csup\u003e2\u003c\/sup\u003e) with RS-2 as the hole selection layer shows a PCE of 34.2%.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eServing as hole selective contact for organic solar cells and perovskite solar cells, RS-2 is an alternative to \u003ca href=\"https:\/\/www.ossila.com\/collections\/pedot\" title=\"pedot:pss\" rel=\"noopener\" target=\"_blank\"\u003ePEDOT:PSS\u003c\/a\u003e with superior performance and the convenience of solution deposition at low concentration, i.e. 1 mM.\u003c\/p\u003e\n\u003ch2 id=\"specifications\"\u003eGeneral Information\u003c\/h2\u003e\n\u003chr\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003eCAS Number\u003c\/th\u003e\n\u003ctd\u003e3058284-08-2\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003eChemical Formula\u003c\/th\u003e\n\u003ctd\u003eC\u003csub\u003e22\u003c\/sub\u003eH\u003csub\u003e17\u003c\/sub\u003eN\u003csub\u003e2\u003c\/sub\u003eO\u003csub\u003e5\u003c\/sub\u003eP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003eMolecular Weight\u003c\/th\u003e\n\u003ctd\u003e420.35 g\/mol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003eAbsorption*\u003c\/th\u003e\n\u003ctd\u003eλ\u003csub\u003emax\u003c\/sub\u003e 426 nm (in THF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003eFluorescence\u003c\/th\u003e\n\u003ctd\u003eλ\u003csub\u003eem\u003c\/sub\u003e (N\/A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003eHOMO\/LUMO\u003c\/th\u003e\n\u003ctd\u003eHOMO = -5.04 eV, LUMO = -2.00 eV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003eSynonyms\u003c\/th\u003e\n\u003ctd\u003e(E)-(1-Cyano-2-(10-(4-methoxyphenyl)-10H-phenoxazin-3-yl)vinyl)phosphonic acid, (E)-(2-(10-(4-methoxyphenyl)-10H-phenoxazin-3-yl)-1-cyanovinyl)phosphonic acid, MOP-PTZ-3CPA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003eClassification or Family\u003c\/th\u003e\n\u003ctd\u003ePhenoxazine derivatives, Self-assembly monolayers, Hole transport layer, Hole selection layer,\u003cem\u003e p-i-n\u003c\/em\u003e Perovskite solar cells\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003chr\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003ePurity\u003c\/th\u003e\n\u003ctd\u003e\u0026gt; 98% (HPLC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003eMelting Point\u003c\/th\u003e\n\u003ctd\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth width=\"38.2%\"\u003eAppearance\u003c\/th\u003e\n\u003ctd\u003eRed powder\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"panel panel-default\"\u003e\n\u003cdiv class=\"panel-body\"\u003e\n\u003ch3\u003eSolution Processing Procedure\u003c\/h3\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cem\u003eTypical processing solvents:\u003c\/em\u003e Methanol, ethanol\u003cbr\u003e\u003cem\u003eTypical suggested concentration: \u003c\/em\u003e1.0 mg\/ml or 1.0 mM\u003cbr\u003e\u003cem\u003eTypical processing procedure: \u003c\/em\u003eRS-2 solution (1.0 mg\/ml) in anhydrous ethanol is spin-coated onto ITO surface for 30 s at the speed of 3000 rpm in a nitrogen filled glovebox, followed by annealing for 10 min at 100 ℃ on a hotplate. The substrate is cooled down to room temperature and then  dynamic cleaned by 100 μL EtOH at 3000 rpm. Then the substrate is annealed at 100 °C for another 5 min (from normal bandgap PSCs fabrication \u003ca href=\"https:\/\/doi.org\/10.1126\/science.adv4551\" rel=\"noopener\" target=\"_blank\"\u003eDOI: 10.1126\/science.adv4551\u003c\/a\u003e).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch2\u003eChemical Structure\u003c\/h2\u003e\n\u003chr\u003e\n\u003cfigure\u003e\u003ca href=\"https:\/\/www.ossila.com\/cdn\/shop\/files\/rs-2-3058284-08-2-chemical-structure-body.png\" title=\"RS-2 chemical structure\" target=\"_blank\"\u003e\u003cimg loading=\"lazy\" alt=\"RS-2 chemical structure\" src=\"https:\/\/www.ossila.com\/cdn\/shop\/files\/rs-2-3058284-08-2-chemical-structure-body.png?height=240\"\u003e \u003c\/a\u003e\n\u003cfigcaption\u003eRS-2 Chemical Structure, CAS No. 3058284-08-2\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003ch2 id=\"msds\"\u003eMSDS Documentation\u003c\/h2\u003e\n\u003chr\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/downloads.ossila.com\/msds\/rs-2.pdf\" title=\"RS-2 MSDS Sheet\" target=\"_blank\"\u003e\u003cimg alt=\"RS-2 MSDS Sheet\" class=\"msds-icon\" height=\"39\" loading=\"lazy\" src=\"https:\/\/www.ossila.com\/cdn\/shop\/files\/product-downloads-msds.svg\" width=\"30\"\u003eRS-2 MSDS Sheet\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2 id=\"literature\"\u003eLiterature and Reviews\u003c\/h2\u003e\n\u003chr\u003e\n\u003col\u003e\n\u003cli\u003eW. Wu et al. (2025), \u003cem\u003eStable and uniform self-assembled organic diradical molecules for perovskite photovoltaics,\u003c\/em\u003e Science 389, 195; \u003ca href=\"https:\/\/doi.org\/10.1126\/science.adv4551\" rel=\"noopener\" target=\"_blank\"\u003eDOI: 10.1126\/science.adv4551\u003c\/a\u003e.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eA. Ullah et al. (2026), \u003cem\u003eSelf-Assembled Monolayers in p–i–n Perovskite Solar Cells: Molecular Design, Interfacial Engineering, and Machine Learning–Accelerated Material Discovery, \u003c\/em\u003eAdv. Mater., e20220; \u003ca href=\"https:\/\/doi.org\/10.1002\/adma.202520220\" rel=\"noopener\" target=\"_blank\"\u003eDOI: 10.1002\/adma.202520220\u003c\/a\u003e.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eX. Zhou et al. (2025), \u003cem\u003eRecent Advances in Self-Assembled Molecules for Inverted Perovskite Photovoltaics,\u003c\/em\u003e Sol. RRL, 9 (22), e202500684; \u003ca href=\"https:\/\/doi.org\/10.1002\/solr.202500684\" rel=\"noopener\" target=\"_blank\"\u003eDOI: 10.1002\/solr.202500684\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2 id=\"related-products\"\u003eRelated Products\u003c\/h2\u003e\n\u003chr\u003e\n\u003cp\u003e[[collection handle=\"self-assembled-monolayers\" limit=\"5\"]]\u003c\/p\u003e\n\u003cdiv class=\"collection-container\"\u003e\n\u003cdiv class=\"collection-tile\"\u003e\u003ca href=\"https:\/\/www.ossila.com\/collections\/self-assembled-monolayers\"\u003e\n\u003cdiv class=\"collection-button background-light-blue\"\u003e\n\u003cimg width=\"150\" src=\"https:\/\/www.ossila.com\/cdn\/shop\/files\/self-assembled-monolayers-collection-design.png?width=150\" loading=\"lazy\" height=\"109\" alt=\"Self-Assembled Monolayers (SAMs)\"\u003e\n\u003cp\u003e\u003cstrong\u003eSelf-Assembled\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMonolayers\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/div\u003e\n\u003cdiv class=\"collection-tile\"\u003e\u003ca href=\"https:\/\/www.ossila.com\/collections\/perovskite-materials\"\u003e\n\u003cdiv class=\"collection-button background-ossila-blue\"\u003e\n\u003cimg width=\"150\" src=\"https:\/\/www.ossila.com\/cdn\/shop\/files\/collection-link-Perovskite-Materials.png?width=150\" loading=\"lazy\" height=\"109\" alt=\"Perovskite Materials\"\u003e\n\u003cp\u003e\u003cstrong\u003ePerovskite Materials\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/div\u003e\n\u003cdiv class=\"collection-tile\"\u003e\u003ca href=\"https:\/\/www.ossila.com\/collections\/semiconducting-molecules\"\u003e\n\u003cdiv class=\"collection-button background-light-blue\"\u003e\n\u003cimg width=\"150\" src=\"https:\/\/www.ossila.com\/cdn\/shop\/files\/collection-link-Semiconducting-Molecules.png?width=150\" loading=\"lazy\" height=\"109\" alt=\"Semiconducting Molecules\"\u003e\n\u003cp\u003e\u003cstrong\u003eSemiconducting\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eMolecules\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/a\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Ossila","offers":[{"title":"250 mg","offer_id":51520579764440,"sku":"M2592A1-250mg","price":345.0,"currency_code":"USD","in_stock":true},{"title":"500 mg","offer_id":51520579797208,"sku":"M2592A1-500mg","price":555.0,"currency_code":"USD","in_stock":true},{"title":"1 g","offer_id":51520579829976,"sku":"M2592A1-1g","price":885.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0823\/0287\/files\/rs-2-3058284-08-2-chemical-structure-title.png?v=1774883626","url":"https:\/\/www.ossila.com\/products\/rs-2","provider":"Ossila","version":"1.0","type":"link"}