材料科学
光电子学
有机太阳能电池
聚合物太阳能电池
有机半导体
开路电压
电压
太阳能电池
光伏系统
能量转换效率
纳米技术
短路
作者
Johannes Widmer,M Max Tietze,Karl Leo,Moritz Riede
标识
DOI:10.1002/adfm.201301048
摘要
Abstract The open‐circuit voltage ( V OC ) of an organic solar cell is limited by the donor‐acceptor material system. The effective gap E g eff between the electron affinity of the acceptor and the ionization potential of the donor is usually regarded as the upper limit for V OC , which is only reached for T → 0 K. This relation is confirmed for a number of small‐molecule bulk heterojunction p‐i‐n type solar cells by varying the temperature and illumination intensity. With high precision, the low temperature limit of V OC is identical to E g eff . Furthermore, the influence of the hole transport material in a p‐doped hole transport layer and the donor‐acceptor mixing ratio on this limit V 0 is found to be negligible. Varying the active material system, the quantitative relation between V 0 and E g eff is found to be identity. A comparison of V 0 in a series of nine different donor‐acceptor material combinations opens a pathway to quantitatively determine the ionization potential of a donor material or the electron affinity of an acceptor material.
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