Effect of coadsorbent on the photovoltaic performance of zinc pthalocyanine-sensitized solar cells.
The effect of chenodeoxycholic acid as a coadsorbent on TiO 2 nanocrystalline solar cells incorporating phthalocyanine sensitizers was studied under various conditions. Adding chenodeoxycholic acid onto TiO 2 nanoparticles not only reduces the adsorption of phthalocyanine sensitizers but also prevents sensitizer aggregation, leading to different photovoltaic performance. The inspection of IPCE and absorption spectra showed that the load of phthalocyanine sensitizers is strongly dependent on the molar concentration of chenodeoxycholic acid coadsorbent. The open circuit voltage of the solar cells with chenodeoxycholic acid coadsorbent increases due to the enhanced electron lifetime in TiO 2 nanoparticles coupled with the band edge shift of TiO 2 to negative potentials.
Yum
Jun-Ho
JH
Institute of Chemical Sciences and Engineering, Swiss Federal Institute of Technology, Lausanne, Switzerland.
Jang
Song-Rim
SR
Humphry-Baker
Robin
R
Grätzel
M
M
Cid
Juan-José
JJ
Torres
Tomas
T
Nazeeruddin
Md K
MK