Single nanowire solar cells are of great interests due to their promising prospects as nano-electronic power sources. Here, we propose a semiconductor nanowire partially covered with a dielectric cap. We demonstrate that with an appropriate degree of the coverage, the partially capped nanowire (PCNW) exhibits strongly enhanced light harvesting in comparison with the bare nanowire (BNW) and core-shell nanowire (CSNW). The enhancement can be attributed to reshaping the radiation patterns due to the symmetry breaking and the strong coupling between the incident light from the upper half space and the leaky mode resonance. We find that the absorption cross section of the PCNW structure integrated over whole space satisfies the fundamental absorption limit, and agrees with the transient coupled-mode theory. We also show that the angle range with high absorption can be adjusted through tuning the degree of coverage. Great increase in short-circuit current and open-circuit voltage enable the PCNW to possess a high power conversion efficiency of 55.31%, which is 141% and 42.7% increase in comparison with that of the BNW (22.95%) and CSNW (38.76%), respectively. The array composed of PCNW also displays superior light absorption and emission efficiency characteristics in comparison with those composed of BNW, CSNW, and the unstructured films. The cap makes the PCNW solar cell a promising candidate for diverse integrated nanosystems, such as photodetectors, nanoelectronic power sources, and super miniature cells.

单纳米线太阳能电池由于其作为纳米电子电源的前景广阔而备受关注。在这里，我们提出了部分覆盖有电介质帽的半导体纳米线。我们证明，与裸露的纳米线（BNW）和核-壳纳米线（CSNW）相比，具有适当覆盖率的部分覆盖的纳米线（PCNW）表现出大大增强的光收集。增强可以归因于由于对称性破坏以及来自上半部空间的入射光与泄漏模式共振之间的强耦合而导致的辐射图案的重塑。我们发现，在整个空间上集成的PCNW结构的吸收截面满足基本吸收极限，并且与瞬态耦合模式理论一致。我们还表明，可以通过调整覆盖率来调整具有高吸收率的角度范围。短路电流和开路电压的大幅提高使PCNW拥有55.31％的高功率转换效率，与BNW（22.95％）和CSNW（38.76％）相比分别提高了141％和42.7％。 ）， 分别。与由BNW，CSNW和非结构化薄膜组成的阵列相比，由PCNW组成的阵列还显示出优异的光吸收和发射效率特性。该盖使PCNW太阳能电池成为各种集成纳米系统（如光电探测器，纳米电子电源和超小型电池）的有前途的候选者。短路电流和开路电压的大幅提高使PCNW拥有55.31％的高功率转换效率，与BNW（22.95％）和CSNW（38.76％）相比分别提高了141％和42.7％。 ）， 分别。与由BNW，CSNW和非结构化薄膜组成的阵列相比，由PCNW组成的阵列还显示出优异的光吸收和发射效率特性。该盖使PCNW太阳能电池成为各种集成纳米系统（如光电探测器，纳米电子电源和超小型电池）的有前途的候选者。短路电流和开路电压的大幅提高使PCNW拥有55.31％的高功率转换效率，与BNW（22.95％）和CSNW（38.76％）相比分别提高了141％和42.7％。 ）， 分别。与由BNW，CSNW和非结构化薄膜组成的阵列相比，由PCNW组成的阵列还显示出优异的光吸收和发射效率特性。该盖使PCNW太阳能电池成为各种集成纳米系统（如光电探测器，纳米电子电源和超小型电池）的有前途的候选者。与由BNW，CSNW和非结构化薄膜组成的阵列相比，由PCNW组成的阵列还显示出优异的光吸收和发射效率特性。该盖使PCNW太阳能电池成为各种集成纳米系统（如光电探测器，纳米电子电源和超小型电池）的有前途的候选者。与由BNW，CSNW和非结构化薄膜组成的阵列相比，由PCNW组成的阵列还显示出优异的光吸收和发射效率特性。该盖使PCNW太阳能电池成为各种集成纳米系统（如光电探测器，纳米电子电源和超小型电池）的有前途的候选者。