High Seebeck Coefficient and Power Factor in n-Type Organic Thermoelectrics
Artikel i vetenskaplig tidskrift, 2018

The n-type thermoelectric properties of [6,6]-phenyl-C 61 -butyric acid methyl ester (PCBM) are investigated for different solution-based doping methods. A novel inverse-sequential doping method where the semiconductor (PCBM) is deposited on a previously cast dopant 4-(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)-N,N-diphenylaniline film to achieve a very high power factor PF ≈ 35 µW m −1 K −2 with a conductivity σ ≈ 40 S m −1 is introduced. It is also shown that n-type organic semiconductors obey the −1/4 power law relation between Seebeck coefficient S and σ that are previously found for p-type materials. An analytical model on basis of variable range hopping unifies these results. The power law for n-type materials is shifted toward higher conductivities by two orders of magnitude with respect to that of p-type, suggesting strongly that n-type organic semiconductors can eventually become superior to their p-type counterparts. Adding a small fraction lower lowest unoccupied molecular orbital material (core-cyanated naphthalene diimide) into PCBM leads to a higher S for inverse-sequential doping but not for bulk doping due to different morphologies.

power factor

organic thermoelectrics

Seebeck coefficient

n-type doping

Författare

Guangzheng Zuo

Linköpings universitet

Zhaojun Li

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Polymerteknologi

Ergang Wang

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Ergang Wang Group

M. Kemerink

Linköpings universitet

Advanced Electronic Materials

2199-160X (ISSN)

Vol. 4 1 1700501

Ämneskategorier

Oorganisk kemi

Materialkemi

Den kondenserade materiens fysik

DOI

10.1002/aelm.201700501

Mer information

Senast uppdaterat

2018-06-07