Solution-processed solar cells based on inorganic bulk heterojunctions with evident hole contribution to photocurrent generation
Solution-processed solar cells based on inorganic bulk heterojunctions with evident hole contribution to photocurrent generation
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基于无机体异质结的溶液处理太阳能电池，空穴对光电流产生有明显贡献
DOI：
10.1039/c5cp00030k
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发表时间：
2015-01-01
影响因子：
3.3
通讯作者：
Wang, Mingtai
中科院分区：
文献类型：
--
作者：
Qiu, Zeliang;Liu, Changwen;Wang, Mingtai
开发溶液处理的新型器件结构对于实现先进和低成本的太阳能电池具有重要意义。在本文中，我们报告的解决方案处理的太阳能电池的基础上，无机体异质结（BHJ）具有体晶体Sb 2S 3吸收层交错与TiO 2纳米阵列作为电子传输体。一种溶液处理的非晶到结晶的转变策略用于制备Sb 2S 3/TiO 2-BHJ。稳态和动态结果表明，Sb 2S 3吸收层中的晶体结构对于高效器件是至关重要的，并且更好的Sb 2S 3结晶有利于更高的器件性能，这是由于减少了界面和体电荷复合，并且在Sb 2S 3层中的缺陷态减少的情况下也提高了开路电压和填充因子。此外，从Sb 2S 3层中的光生空穴的光电流产生的一个明显的贡献揭示了由实验和模拟的动态数据。这些结果暗示了一种潜在的非激子BHJ的能量转换。
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.