Qiu Zeliang, Liu Changwen, Pan Guoxing, Meng Weili, Yue Wenjin, Chen Junwei, Zhou Xun, Zhang Fapei, Wang Mingtai
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, P. R. China.
Phys Chem Chem Phys. 2015 May 14;17(18):12328-39. doi: 10.1039/c5cp00030k.
To develop solution-processed and novel device structures is of great importance for achieving advanced and low-cost solar cells. In this paper, we report the solution-processed solar cells based on inorganic bulk heterojunctions (BHJs) featuring a bulk crystalline Sb2S3 absorbing layer interdigitated with a TiO2 nanoarray as an electron transporter. A solution-processed amorphous-to-crystalline transformation strategy is used for the preparation of Sb2S3/TiO2-BHJs. Steady-state and dynamic results demonstrate that the crystalline structure in the Sb2S3 absorbing layer is crucial for efficient devices, and a better Sb2S3 crystallization favors a higher device performance by increasing the charge collection efficiency for a higher short-circuit current, due to reduced interfacial and bulk charge recombinations, and enhancing the open-circuit voltage and fill factor with the reduced defect states in the Sb2S3 layer as well. Moreover, an evident contribution to photocurrent generation from the photogenerated holes in the Sb2S3 layer is revealed by experimental and simulated dynamic data. These results imply a kind of potential non-excitonic BHJ for energy conversion.
开发溶液处理的新型器件结构对于实现先进且低成本的太阳能电池至关重要。在本文中，我们报道了基于无机体异质结（BHJ）的溶液处理太阳能电池，其具有块状晶体Sb2S3吸收层与作为电子传输体的TiO2纳米阵列相互交错。采用溶液处理的非晶到晶体转变策略来制备Sb2S3/TiO2-BHJ。稳态和动态结果表明，Sb2S3吸收层中的晶体结构对于高效器件至关重要，更好的Sb2S3结晶通过提高电荷收集效率以获得更高的短路电流，减少界面和体电荷复合，并减少Sb2S3层中的缺陷态来提高开路电压和填充因子，从而有利于提高器件性能。此外，实验和模拟的动态数据揭示了Sb2S3层中光生空穴对光电流产生的明显贡献。这些结果暗示了一种潜在的用于能量转换的非激子BHJ。
