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We were able to attach CdSe quantum dots (QDs) having a ZnS inorganic glue layer directly to a mesoporous TiO2(mp-TiO2) surface by spray coating and thermal annealing. Quantum-dot-sensitized solar cells based on CdSe QDs having ZnS as the inorganic glue layer could easily transport generated charge carriers because of the intimate bonding between CdSe and mp-TiO2. The application of spray pyrolysis deposition (SPD) to obtain additional CdSe layers improved the performance characteristics to Voc= 0.45 V, Jsc= 10.7 mA/cm2, fill factor = 35.8%, and power conversion efficiency = 1.7%. Furthermore, ZnS post-treatment improved the device performance to Voc= 0.57 V, Jsc= 11.2 mA/cm2, fill factor = 35.4%, and power conversion efficiency = 2.2%. [ABSTRACT FROM AUTHOR]

Sb2S3-sensitized mesoporous-TiO2solar cells using several conjugated polymers as hole-transporting materials (HTMs) are fabricated. We found that the cell performance was strongly correlated with the chemical interaction at the interface of Sb2S3as sensitizer and the HTMs through the thiophene moieties, which led to a higher fill factor (FF), open-circuit voltage (Voc), and short-circuit current density (Jsc). With the application of PCPDTBT (poly(2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]dithiophene)-alt-4,7(2,1,3-benzothiadiazole)) as a HTM in a Sb2S3-sensitized solar cell, overall power conversion efficiencies of 6.18, 6.57, and 6.53% at 100, 50, and 10% solar irradiation, respectively, were achieved with a metal mask. [ABSTRACT FROM AUTHOR]

We report all solid-state nanostructured inorganic−organic heterojunction solar cells fabricated by depositing Sb2S3and poly(3-hexylthiophene) (P3HT) on the surface of a mesoporous TiO2layer, where Sb2S3acts as an absorbing semiconductor and P3HT acts as both a hole conductor and light absorber. These inorganic−organic light harvesters perform remarkably well with a maximum incident-photon-to-current efficiency (IPCE) of 80% and power conversion efficiency of 5.13% under air-mass 1.5 global (AM 1.5G) illumination with the intensity of 100 mW cm−2. These devices are highly stable under room light in air, even without encapsulation. The present findings offer novel directions for achieving high-efficiency solid-state solar cells by hybridization of inorganic−organic light harvesters and hole transporters. [ABSTRACT FROM AUTHOR]