Elucidating the factors that determine the open circuit voltage in discrete heterojunction organic photovoltaic cells

被引:22
作者
Chauhan, Virendra [1 ]
Hatton, Ross [1 ]
Sullivan, Paul [1 ]
Jones, Tim [1 ]
Cho, Sang Wan [2 ]
Piper, Louis [2 ]
deMasi, Alex [2 ]
Smith, Kevin [2 ]
机构
[1] Univ Warwick, Dept Chem, Coventry CV4 7AL, W Midlands, England
[2] Boston Univ, Dept Phys, Boston, MA 02215 USA
基金
美国国家科学基金会; 英国工程与自然科学研究理事会;
关键词
PHTHALOCYANINE CLALPC; WORK FUNCTION; SOLAR-CELLS; BAND; TRANSPORT; ALIGNMENT; ORIGIN; FILM; UPS;
D O I
10.1039/b919723k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The operation of discrete heterojunction organic photovoltaic (OPV) cells employing chloroaluminium phthalocyanine (ClAlPc) as the electron donor and C-60 as the electron acceptor is reported and the characteristics are correlated with the energy level structure of the devices determined using X-ray photoelectron spectroscopy. The results give new insight into the origin of the open circuit voltage (V-oc) in discrete heterojunction OPVs. The measured V-oc in this system is found to be determined by: (i) the frontier orbital energy offsets between the donor and acceptor materials, accounting for the likely formation of an abrupt vacuum level shift at the heterojunction interface and (ii) the degree of alignment between the hole-extracting electrode Fermi level and the highest occupied molecular orbital energy of the electron donor material. The generality of the findings is demonstrated by rationalising the V-oc in OPVs employing the archetypal electron donor, copper phthalocyanine.
引用
收藏
页码:1173 / 1178
页数:6
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