Baran Group Meeting

- - Terry Lou Materials development (Cont'd) Photosensitizer (Dye) Dye-Sensitized Solar Cells Other metal complexes were studied, e.g. Os, Re, Fe, Pt and Cu Poor absorption, slow e- transfer with electrolyte and fast recombination are common challenges Porphyrins COOH Organic dyes Baran Group Meeting Jun 5, 2021 Structurally diverse molecules can be designed and synthesized. Lower cost and environmental hazards than metal complexes Higher extinction coefficient than Ru complexes Most adopted D-π-A design Coumarins HOOC -NH HN COOH CN CO₂H CN COOH COOH H2TCPP (Wamser, 2000) n = 3%; IPCE max = 55% low efficiency due to aggregation (Officer, 2007) -COOH HOOC n = 7.1%; 3.6% in solid state DSSC; Optimize energy level at ẞ-position C343 n = 0.9%; narrow absorption range; fast injection (200 fs) Indolines NKX-2311 n = 6%; absorption red-shifted vs C343 NKX-2677 n = 8.1%; thiophene extend π- conjugation; avoid isomerization, improve stability CN .COOH Donor π-bridge Acceptor CN .COOH (Tan, 2009) n = 4.3%; D-π-A design for intramolecular charge separation (Tan, 2009) n = 5.1%; n-Hex suppress charge recombination and dye aggregation D149 n=9%; rhodanine red-shift absorption COOH D205 n = 9.5% (N719, 11.2%) COOH 5

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